I need help with q5

I need help with q5 class=

Verified Answer :

percent increase = ((new number - original number) / (original number)) x 100.

percent increase = ((3000 - 2500) / 2500)) x 100 =
                                   (500 / 2500)....x 100 =
                                     0.2 x 100 =
                                      20% increase <====

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