math
posted by Randy on .
4. the area of a rectangle is 450 m^2. both the length and width of the rectangle are increased by 10%. what is the area of the new rectangle?

100% = 100 / 100 = 1
10 % = 10 / 100 = 0.1
100% + 10 % = 1 + 0.1 = 1.1
A = Original Area
A1 = New Area
Original Area:
A = W * L = 450 m ^ 2
New Area:
A1 = 1.1 * W * 1.1 * L
A1 = 1.1 * 1.1 * W * L
( Remark: W * L = A )
A1 = 1.21 * A
A1 = 1.21 * 450 = 544.5 m ^ 2