1.  A student was asked to measure the length and breadth of a rectangle. By mistake, he measured the length 20% less and the breath 10% more. If it’s original area is 200 sq cm, then find the area after this measurement?
A. 176 sq cm
B. 206 sq cm
C. 226 sq cm
D. 316 sq cm

Answer: Option A

Explanation:

Net effect on area = -20 + 10 + [(-20 )(10)/100] %

= (-10 - 2) % = -12%

Now, after this mistake new area = (100 - 12)% of 200

= (88/100) x 200

= 176 sq cm