PSAT Math : How to find percentage equivalent to a decimal
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Example Questions
Example Question #1 : Decimals And Percentage
If 20% of x is equal to 160% of y, then y is what percent of x?
12.5
1.25
800
125
8
12.5
We are told that 20% of x is equal to 160% of y. We need to write expressions for 20% of x and 160% of y and set them equal to one another.
In order to find an expression for 20% of x, we can write 20% as a decimal and multiply it by x. Since 20% = 0.20, we can write 20% of x as 0.2x.
Similarly, we can write 160% as 1.60y.
Now, we set these expressions equal to one another.
0.2x = 1.60y.
Since the question asks us to find y as a percentage of x, we need to solve for y in terms of x. Let's divide both sides of the equation by 1.60.
0.125x = y.
Therfore, y is equal to 0.125x, which is the same as 12.5% of x, since 12.5% expressed as a decimal is 0.125.
The answer is 12.5.
Example Question #1 : How To Find Percentage Equivalent To A Decimal
Express .789 as a percentage.
7.89%
78.9%
789%
0.789%
78.9%
Move the decimal two places to the left to convert a decimal to a percentage. Therefore, .789 is equivalent to 78.9%.
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