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'.

Q: Problem: in how many years rs 160 will produce the same interest at 8 % as rs . 500 produce in 4 years at 8 % 
Options: a ) 13 , b ) 13.5 , c ) 11.5 , d ) 12.5 , e ) 12

A: d
****
Q: Problem: if 40 % of a certain number is 160 , then what is 90 % of that number ? 
Options: a ) 270 , b ) 380 , c ) 260 , d ) 360 , e ) 290

A: d
****
Q: Problem: a dealer purchases 15 articles for rs . 25 and sells 12 articles for rs . 35 . find the profit percentage ? 
Options: a ) 80 % , b ) 50 % , c ) 75 % , d ) 40 % , e ) 53 %

A:
c
****