Trevor needs to pay 6% interest on $3,000 that he is borrowing which amounts to an additional $180, bringing the total cost to $4,180.  

When calculating interest on an item you need to multiply the amount of the item by the interest in decimal form. 16% is equivalent to .16.

$\displaystyle $465.99*.16=74.56$. The second step is to add the interest to the original amount of the item $\displaystyle 465.99+74.56$, which would give you an answer of $\displaystyle \$540.55$.

You can also solve this problem in one step by multiplying the original price of the item by 1.16. This number means that you are paying for 100% of the item plus the 16% interest. $\displaystyle 465.99\times1.16=540.55$.

To find the simple interest, we use the formula

$\displaystyle \text{simple interest} = \text{principal} \cdot \text{rate} \cdot \text{time}$

or

$\displaystyle SI = P \cdot R \cdot T$

where the principal is the initial amount we desposit, the rate is the percentage of interest accruing, and the time is the number of years.

We know

$\displaystyle P = \$2000$

$\displaystyle R = 5\% \ \text{or} \ 0.05$

$\displaystyle T = 3$

So we substitute, and we get

$\displaystyle SI = \$2000 \cdot 0.05 \cdot 3$

$\displaystyle SI = \$300$

Therefore, the simple interested earned is $300.

To find the simple interest accrued, we will use the formula

$\displaystyle \text{simple interest} = \text{principal} \cdot \text{rate} \cdot \text{time}$

or

$\displaystyle \text{simple interest} = P \cdot R \cdot T$

We know the following

$\displaystyle P = \$400$

$\displaystyle R = 5\% \ \text{or} \ 0.05$

$\displaystyle T = 10 \text{ years}$

We can substitute into the formula.  We get

$\displaystyle \text{simple interest} = \$400 \cdot 0.05 \cdot 10$

$\displaystyle \text{simple interest} = \$200$

Therefore, the amount of interest earned is $200.

To find the interest earned, we use the following formula

$\displaystyle \text{simple interest} = P \cdot R \cdot T$

where P is the principal or amount deposited, R is the rate of interest earned, and T is the time in years.  Using this formula, we can substitute.  We get

$\displaystyle \text{simple interest} = \$2000 \cdot 12\% \cdot 5$

$\displaystyle \text{simple interest} = \$2000 \cdot 0.12 \cdot 5$

$\displaystyle \text{simple interest} = \$1200$

Therefore, the amount of interested earned after 5 years is $1200.

To find simple interest, we use the following formula:

$\displaystyle \text{simple interest} = P \cdot R \cdot T$

where

$\displaystyle P = \text{principal or amount deposited}$

$\displaystyle R = \text{percentage rate}$

$\displaystyle T = \text{time in years}$

Given what we know

$\displaystyle P = \$1500$

$\displaystyle R = 7\% \text{ or } 0.07$

$\displaystyle T = 6 \text{ years}$

we can substitute into the formula.  We get

$\displaystyle \text{simple interest} = \$1500 \cdot 0.07 \cdot 6$

$\displaystyle \text{simple interest} = \$630$

Therefore, you earned a total of $\displaystyle \$630$ in simple interest.

To find simple interest, we use the following formula:

$\displaystyle \text{simple interest} = P \cdot R \cdot T$

where

$\displaystyle P = \text{principal or amount deposited}$

$\displaystyle R = \text{percentage rate}$

$\displaystyle T = \text{time in years}$

Given what we know

$\displaystyle P = \$400$

$\displaystyle R = 3\% \text{ or } 0.03$

$\displaystyle T = 4 \text{ years}$

we can substitute into the formula.  We get

$\displaystyle \text{simple interest} = \$400 \cdot 0.03 \cdot 4$

$\displaystyle \text{simple interest} = \$48$

Therefore, you earned a total of $\displaystyle \$48$ in simple interest.

To find simple interest, we use the following formula:

$\displaystyle \text{simple interest} = P \cdot R \cdot T$

where

$\displaystyle P = \text{principal or amount deposited}$

$\displaystyle R = \text{percentage rate}$

$\displaystyle T = \text{time in years}$

Given what we know

$\displaystyle P = \$550$

$\displaystyle R = 6\% \text{ or } 0.06$

$\displaystyle T = 3 \text{ years}$

we can substitute into the formula.  We get

$\displaystyle \text{simple interest} = \$550 \cdot 0.06 \cdot 3$

$\displaystyle \text{simple interest} = \$99$

Therefore, you earned a total of $\displaystyle \$99$ in simple interest.

To find simple interest, we use the following formula:

$\displaystyle \text{simple interest} = P \cdot R \cdot T$

where

$\displaystyle P = \text{principal or amount deposited}$

$\displaystyle R = \text{percentage rate}$

$\displaystyle T = \text{time in years}$

Given what we know

$\displaystyle P = \$700$

$\displaystyle R = 4\% \text{ or } 0.04$

$\displaystyle T = 2.5 \text{ years}$

we can substitute into the formula.  We get

$\displaystyle \text{simple interest} = \$700 \cdot 0.04 \cdot 2.5$

$\displaystyle \text{simple interest} = \$70$

Therefore, you earned a total of $\displaystyle \$70$ in simple interest.

Convert 4% into a decimal...

4% = 0.04

...and multiply by the face value of the bond. If $\displaystyle x$ is the interest paid after one year, the equation would look like this:

$\displaystyle x=500\times0.04$

$\displaystyle x=20$