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 :
Choices.
A) 8%
B) 1%
C) 20%
D) 80%
E) None
Explanation:   Let the business value changes from x to y.   Then, 4% of x = 5% of y or 4/100×x=5/100×y   or y = 4/5x   20%hange in business = (x−4/5x)=1/5x   Percentage slump in business   = (1/5x×1/x×100)%   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 :