If width of a rectangle is increased by 10% and the length is decreased by 20%, by what percent does the area decrease?
A)2%
B)12%
C)16%
D)20%
E)21%

Question

Quizplus · Accepted Answer

Original area = a x b Revised area = 1.1a x 0.8b = 0.88ab
Decrease in area = 0.12 = 12%
Key takeaway: The word problems based on basic geometry are easy to tackle if you remember simple formulae ( perimeter, area ) of rectangle, square, circle etc. and their applications.

If Width of a Rectangle Is Increased by 10% and the Length