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: at what rate percent of simple interest will a sum of money double itself in 22 years ? 
Options: a ) 6.54 % , b ) 4.54 % , c ) 8 . 2 % , d ) 4.94 % , e ) 5.54 %
[EX A]: b

[EX Q]: Problem: if a book is sold at 10 % profit instead of 10 % loss , it would have brought rs 14 more . find out the cost price of the book 
Options: a ) 75 , b ) 72 , c ) 60 , d ) 70 , e ) 80
[EX A]: d

[EX Q]: Problem: harkamal purchased 8 kg of grapes at the rate of 70 per kg and 9 kg of mangoes at the rate of 55 per kg . how much amount did he pay to the shopkeeper ? 
Options: a ) 1000 , b ) 1055 , c ) 1065 , d ) 1075 , e ) 1080
[EX A]:
b