In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Input: Consider Input: Problem: how many paying stones , each measuring 2 1 / 2 m * 2 m are required to pave a rectangular court yard 20 m long and 16 1 / 2 m board ?
Options: a ) 66 , b ) 18 , c ) 16 , d ) 10 , e ) 15

Output: a

Input: Consider Input: Problem: how many numbers between 190 and 580 are divisible by 45 and 6 ?
Options: a ) 6 , b ) 7 , c ) 8 , d ) 9 , e ) 10

Output: a

Input: Consider Input: Problem: an employee ' s annual salary was increased $ 5000 . if her new annual salary now equals $ 25000 what was the percent increase ?
Options: a ) 15 % , b ) 80 % , c ) 20 % , d ) 22 % , e ) 24 %
Output: b