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'.
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Question: Problem: the annual interest rate earned by an investment increased by 11 percent from last year to this year . if the annual interest rate earned by the investment this year was 22 percent , what was the annual interest rate last year ? 
Options: a ) 17 % , b ) 19 % , c ) 18 % , d ) 20 % , e ) 22 %

Answer: d


Question: Problem: on a sum of money , the simple interest for 2 years is rs . 324 , while the compound interest is rs . 340 , the rate of interest being the same in both the cases . the rate of interest is 
Options: a ) 15 % , b ) 14.25 % , c ) 9.87 % , d ) 10.5 % , e ) 11.5 %

Answer: c


Question: Problem: a sum of money at simple interest amounts to rs . 815 in 2 years and to rs . 854 in 3 years . the sum is : 
Options: a ) 500 , b ) 698 , c ) 780 , d ) 737 , e ) none

Answer:
d