Task: Question Answering
Input (English): Problem: an enterprising businessman earns an income of re 5 on the first day of his business . on every subsequent day , he earns an income which is just thrice of that made on the previous day . on the 10 th day of business , he earns an income of : 
Options: a ) 21 , b ) 22 , c ) 20 , d ) 45 , e ) 30
Output (English): d