Question

Review the bar graph below:

Answer 1

B. 12.5%

Explanation:

Add all the hours together to get 20. We make the assumption that 20 is 100% since it is our output value. We next represent the value we seek with x. From step 1, it follows that 100%=20. In the same vein, x%=2.5.This gives us a pair of simple equations:

100%=20(1)

x%=2.5(2)

By simply dividing equation 1 by equation 2 and taking note of the fact that both the LHS (left hand side) of both equations have the same unit (%); we have

`(100)/(x)`=
`(20)/(2.5)`

Taking the inverse (or reciprocal) of both sides gives us this:

`(x)/(100) =(2.5)/(20)`

>> x=12.5\%

Therefore, 2.5 is 12.5% of 20.