Question

What is the percent of increase from 25 to 35?

A.
10%

B.
29%

C.
40%

D.
71%

Answer 1

x - the percent increase


`25+25x=35 \ \ \ |-25 \\ 25x=10 \ \ \ |/ 25 \\ x=(10)/(25) \\ \Downarrow \\ x=(10)/(25)=(10 * 4)/(25 * 4)=(40)/(100)=40\%`

The answer is C. 40% increase.