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

answers-

a : the precent change was 17%
b: the precent change was 20%
c: the precent change was 80%
d: the precent change was 120%

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