If the length of a rectangle is increased by 10% and its width is reduced by 10%, what is the percentage change in the area of the new rectangle?

Explanation

When the length is increased by 10%, it becomes 1.1 times the original length. When the width is decreased by 10%, it becomes 0.9 times the original width. The new area is 1.1 × 0.9 = 0.99 times the original area, which means the area decreases by 1%.