In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: x and y started a business by investing rs . 36000 and rs . 42000 respectively after 4 months z joined in the business with an investment of rs . 48000 , then find share of z in the profit of rs . 13860 ? 
Options: a ) 4032 , b ) 4000 , c ) 3250 , d ) 3825 , e ) 3985
[EX A]: a

[EX Q]: Problem: the price of a book is increased from $ 300 to $ 480 . what is the % of increase in its price ? 
Options: a ) 10 % , b ) 20 % , c ) 40 % , d ) 50 % , e ) 60 %
[EX A]: e

[EX Q]: Problem: a money lender finds that due to a fall in the annual rate of interest from 8 % to 7 3 / 4 % his yearly income diminishes by rs . 65.50 , his capital is ? 
Options: a ) 24,602 , b ) 26,200 , c ) 24,600 , d ) 24,628 , e ) 24,6012
[EX A]:
b