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: $ 2,000 is deposited in a savings account that pays 4 % annual interest compounded semiannually . to the nearest dollar , how much is in the account at the end of the year ?
Options: a ) $ 2125.15 , b ) $ 2083.12 , c ) $ 2184.22 , d ) $ 2150.84 , e ) $ 2080.80
e

Problem: a number exceeds 20 % of itself by 40 . the number is ?
Options: a ) 50 , b ) 60 , c ) 80 , d ) 320 , e ) none
a

Problem: jar a has 16 % more marbles than jar b . what percent of marbles from jar a need to be moved into jar b so that both jars have equal marbles ?
Options: a ) 5 % , b ) 7 % , c ) 9 % , d ) 11 % , e ) 13 %
b