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: the length of a rectangular floor is more than its breadth by 200 % . if rs . 441 is required to paint the floor at the rate of rs . 3 / sq m , what would be the length of the floor ? 
Options: a ) 12 , b ) 18 , c ) 20 , d ) 21 , e ) 24
[EX A]: d

[EX Q]: Problem: a solution contains 8 parts of water for every 7 parts of lemonade syrup . how many parts of the solution should be removed and replaced with water so that the solution will now contain 30 % lemonade syrup ? 
Options: a ) 1.5 , b ) 1.75 , c ) 2.14 , d ) 2.34 , e ) 2.64
[EX A]: c

[EX Q]: Problem: the true discount on a bill due 9 months hence at 16 % per annum is rs . 270 . the amount of the bill is 
Options: a ) 2200 , b ) 2520 , c ) 2600 , d ) 3354 , e ) none of these
[EX A]:
b