Question

A rectangular garden is 9 feet long and 3 feet wide. A second rectangular garden has dimensions that are triple the dimensions of the first garden. What is the percent of change in perimeter from the first garden to the second garden?

Answer 1

Perimeter of small garden = 2 * 9 + 2 * 3 = 24 feet
Perimeter of large garden =2 * 27 + 2 * 9 = 72 feet

Since the dimensions have been increased by 3, the perimeter increases by 3.
(If we were calculating area, it increases by 9).