If enrollment in a class went from 30 people last term to 25 people this term, what is the percent decrease? Round to the nearest percent.

 17%

Explanation:

The change in value is 30-25 = 5, so the amount has dropped by 5

Divide this change over the original amount to get 5/30 = 0.1667 approximately. This converts to 16.67% roughly, and that rounds to 17%

Here's a way to do it using a formula

A = old value = 30

B = new value = 25

C = percent change

C = [ (B-A)/A ] * 100%

C = [ (25-30)/30 ] * 100%

C = -0.1667 * 100%

C = -16.67%

C = -17%

The negative percent change means we have a percent decrease. The class size went down by about 17%.

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post

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