Question

What is the approximate percent change in a temperature that went down from 120 degrees to 100 degrees?

Answer 1

The reduction in temperature = (120 - 100)
                                               = 20
 Since it happened from 120 degrees, we can find out the reduction percentage as follows
(20/120) * 100
(1/6) * 100
16.7 %

Approximately 17 %

so the answer is A

Answer 2

120 - 100 = 20

20/120 = 16.666666

Round up to 17

17%