Task: Question Answering
Input (English): Problem: a certain airline ' s fleet consisted of 90 type a planes at the beginning of 1980 . at the end of each year , starting with 1980 , the airline retired 3 of the type a planes and acquired 4 new type b plans . how many years did it take before the number of type a planes left in the airline ' s fleet was less than 50 percent of the fleet ? 
Options: a ) 11 , b ) 12 , c ) 13 , d ) 14 , e ) 15
Output (English): c