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: if a lends rs . 2000 to b at 15 % per annum and b lends the same sum to c at 17 % per annum then the gain of b in a period of 4 years is ? 
Options: a ) 155 , b ) 162 , c ) 157.5 , d ) 160 , e ) 157.12
[EX A]: d

[EX Q]: Problem: find the simple interest on rs . 350 for 10 months at 5 paisa per month ? 
Options: a ) 277 , b ) 175 , c ) 288 , d ) 266 , e ) 121
[EX A]: b

[EX Q]: Problem: the s . i . on a certain sum of money for 6 years at 14 % per annum is half the c . i . on rs . 7000 for 2 years at 7 % per annum . the sum placed on s . i . is ? 
Options: a ) 603.75 , b ) 555.75 , c ) 569.55 , d ) 256.25 , e ) 563.23
[EX A]:
a