TASK DEFINITION: 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'.
PROBLEM: Problem: how is 4 % expressed as a decimal fraction ? 
Options: a ) 0.4 , b ) 0.04 , c ) 0.004 , d ) 0.0004 , e ) 4

SOLUTION: b

PROBLEM: Problem: in order to obtain an income of rs . 1000 from 50 % stock at rs . 500 , one must make an investment of 
Options: a ) rs . 17000 , b ) rs . 16050 , c ) rs . 15400 , d ) rs . 10000 , e ) rs . 10500

SOLUTION: d

PROBLEM: Problem: by selling an article at rs . 800 , a profit of 25 % is made . find its cost price ? 
Options: a ) s . 486 , b ) s . 455 , c ) s . 640 , d ) s . 480 , e ) s . 489

SOLUTION:
c