When the length of a rectangle is increased by 20 percent and the width is increased by 10 percent, by what percent is the area increased?

Answer 1

1.2l * 1.1w = 1.32*lw
so, it grew by ??

Answer 2

Let width = 2 Ft.
Length = 4 Ft..
Area = 2 * 4 = 8 Ft^2.

Width = 1.1 * 2 = 2.2 Ft.
Length = 1.2 * 4 = 4.8 Ft.
Area = L * W = 4.8 * 2.2 = 10.56 Ft.^2.

10.56/8 = 1.32 = 132%.
Increase = 132%-100% = 32%.

Answer 3

A1 = L * W .

A2 = 1.1W * 1.2*L = 1.32LW.

A2/A1 = 1.32LW/LW = 1.32 = 132%.

132% - 100% = 32% Increase.

Answer 4

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