The income of a broker remains unchanged though the rate of commission is increased from 4% to 5%. The percentage of slump in business is ?  Options
A) 8%
B) 1%
C) 20%
D) 80%
E) NONE
Answer   Let the business value change from A to B.   Then, 4% of A = 5% of B   ⇒ 4A/100 = 5B/100   ⇒ B = 4A/5   ∴ change in business = (A - 4A/5) = A/5   Percentage slump in business = {(A/5)/A} x 100 % = 20%   20%orrect Option: 20%
<result>C</result>
The income of a broker remains unchanged though the rate of commission is increased from 4% to 5%. The percentage of slump in business is ?