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: 3 seventh of a number is 12 more than 40 % of that number . what will be the 30 % of that number ?
Options: a ) a ) 148 , b ) b ) 210 , c ) c ) 63 , d ) d ) 248 , e ) e ) 258
[EX A]: c

[EX Q]: Problem: the present population of a town is 280 . population increase rate is 10 % p . a . find the population of town after 1 years ?
Options: a ) 100 , b ) 120 , c ) 200 , d ) 220 , e ) 308
[EX A]: e

[EX Q]: Problem: an error 2.5 % in excess is made while measuring the side of a square . the percentage of error in the calculated area of the square is
Options: a ) 6.04 % , b ) 5.14 % , c ) 5.23 % , d ) 5.0625 % , e ) 5.5 %
[EX A]:
d