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: find the principle on a certain sum of money at 5 % per annum for 4 years if the amount being rs . 1120 ? 
Options: a ) 933 , b ) 1067 , c ) 1977 , d ) 1056 , e ) 1097
[EX A]: a

[EX Q]: Problem: if an article is sold at 18 % profit instead of 9 % profit , then the profit would be $ 54 more . what is the cost price ? 
Options: a ) $ 500 , b ) $ 600 , c ) $ 700 , d ) $ 800 , e ) $ 900
[EX A]: b

[EX Q]: Problem: a part of certain sum of money is invested at 8 % per annum and the rest at 12 % per annum , if the interest earned in each case for the same period is equal , then ratio of the sums invested is ? 
Options: a ) 3 : 2 , b ) 4 : 8 , c ) 4 : 3 , d ) 4 : 0 , e ) 4 : 9
[EX A]:
a