Each side of a rectangular field is diminished by 40%. By how much percent is the area of the field diminished ?

A. 32%

B. 64%

C. 25%

D. 16%

Answer: Option B

Solution(By Examveda Team)

By using successive formula
Net decrease in area
$$\eqalign{ & = 40 + 40 - \frac{{40 \times 40}}{{100}} \cr & = 64\% \cr} $$