ACT Math : How to find decimal equivalent to a percentage
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Example Question #121 : Arithmetic
Students at a country fair typically spend $40. The students have agreed to spend 40% less at this year's fair. Assuming all the students follow their new agreement, what is the most that could be spent by a student at this year's fair?
$24
$20
$30
$10
$16
$24
This is a percentage problem, so it is important to know that 40% of some value is equal to 0.4 of said value. So to find 40% of $40, we multiply 40 * 0.40, which equals 16. This 16 represents 40% of the original value of $40. So if a student was to spend 40% less than they usually spend, we would subtract $16, which is 40% of the original value, from $40, giving us an answer of $24.
Example Question #122 : Arithmetic
There are n pennies in a jar. Let p represent the decimal ratio of the pennies that are dated before 1983. Which of the following equations repesents the number of pennies that are dated 1983 or later?
n(100-p)
np
n(1-p)
n(1-p)/100
n(1-p)
The proportion of pennies before 1983 would be np. Therefore, the pennies dated 1983 or later would be n(1-p).
Example Question #123 : Arithmetic
Express the following as a decimal:
To convert a percentage to a decimal, you must add a decimal two points to the left from the right hand side. Thus,
Example Question #124 : Arithmetic
Which of the following is equivalent to ?
To find a decimal from a percentage, divide the percentage value by . In this case, convert the fraction to a decimal first:
Example Question #123 : Arithmetic
A share in a stock is added to a share by speculators. What is the decimal equivalent of the combined shares?
To convert from a percentage to a decimal, divide the decimal by . In this case, we can add the percentages first.
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