instruction:
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'.
question:
Problem: at what rate percent per annum will the simple interest on a sum of money be 1 / 5 of the amount in 10 years ?
Options: a ) 2 % , b ) 7 % , c ) 9 % , d ) 3 % , e ) 1 %
answer:
a

question:
Problem: how many liters of a 40 % iodine solution need to be mixed with 35 liters of a 20 % iodine solution to create a 32 % iodine solution ?
Options: a ) 35 , b ) 49 , c ) 100 , d ) 102 , e ) 140
answer:
d

question:
Problem: find the principle on a certain sum of money at 5 % per annum for 2 years if the amount being rs . 1120 ?
Options: a ) 1018 , b ) 1067 , c ) 1977 , d ) 1056 , e ) 1097
answer:
a