If the length of a rectangle is increased by 20% and width is decreased by 20% what is the change in area of the rectangle?

A unchanged

B decreases by 4%

C increases by 4%

D increases by 5%

Correct Answer: Option B

গড় পরিবর্তন = A + B + (A x B)÷100
= 20 + (-20) + (20 x (-20))÷100
= -4%