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: from the sale of sleeping bags , a retailer made a gross profit of 16 % of the wholesale cost . if each sleeping bag was sold for $ 28 , what was the wholesale cost per bag ?
Options: a ) 3.0 , b ) 3.36 , c ) 24.13 , d ) 25.0 , e ) 31.36
[EX A]: c

[EX Q]: Problem: if each year the population of the country grows by 40 % , how many years will elapse before the population of the country doubles ?
Options: a ) 3 , b ) 4 , c ) 5 , d ) 6 , e ) 7
[EX A]: a

[EX Q]: Problem: find the annual income derived by investing $ 6800 in 60 % stock at 136 .
Options: a ) 550 , b ) 3000 , c ) 250 , d ) 300 , e ) 400
[EX A]:
b