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'.

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
a

Problem: the profit earned by selling an article for rs . 753 is equal to the loss incurred when the same article is sold for rs . 455 . what should be the sale price for making 50 % profit ? 
Options: a ) 706 , b ) 786 , c ) 906 , d ) 896 , e ) 696
c

Problem: an article is bought for rs . 575 and sold for rs . 675 , find the gain percent ? 
Options: a ) 17.39 % , b ) 33 1 / 6 % , c ) 33 1 / 3 % , d ) 38 1 / 3 % , e ) 33 2 / 3 %

a