SOLUTION: The length of a rectangle is increased by 20 percent and its width is increased by fifty percent. By what percent does the area increase?
(A) 70 (B) 80 (C) 100 (D) 170 (E) 180
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Question 245874: The length of a rectangle is increased by 20 percent and its width is increased by fifty percent. By what percent does the area increase?
(A) 70 (B) 80 (C) 100 (D) 170 (E) 180
Answer by dabanfield(803) (Show Source): You can put this solution on YOUR website!
The length of a rectangle is increased by 20 percent and its width is increased by fifty percent. By what percent does the area increase?
(A) 70 (B) 80 (C) 100 (D) 170 (E) 180
Let L be the original length and W the original width. The area of the rectangle is L*W.
By increasing the Length to 1.2*L and the width to 1.5*W the new area is:
(1.2)L*(1.5)W = (1.2*1.5)(L*W) = 1.8*(L*W)= 1.8*A = A + .80*A
So the answer is (B) 80
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