SOLUTION: By hw much does the area of a rectangle increase if the length nd width is increased by 10%

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Question 1003767: By hw much does the area of a rectangle increase if the length nd width is increased by 10%
Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
say our rectangle has length of 20 and width of 10, then
area of rectangle is 20 * 10 = 200
now we increase length and width by 10 percent
length is 22 and width is 11
new area is 22 * 11 = 242
the area has increased by 42 or 42/200 is 21%