The length of a rectangle is increased by 60 %. By what percent would the width have to be decreased to maintain the same area?

A. 37 ½ %
B. 60 %
C. 75 %
D. none of these
Explanation:
Let length = 100 m.
Breath = 100 m.
New length = 160 m.
New breath = x meters
Then, = 160 × x = 100 × 100
(or) X = (100 ×100)/160 × 125/2
Decrease in breadth = (100- 125/2) % = 37 ½ %