Task: Question Answering
Input (English): Problem: in an institute , 60 % of the students are boys and the rest are girls . further 15 % of the boys and 7.5 % of the girls are getting a fee waiver . if the number of those getting a fee waiver is 90 , find the total number of students getting 50 % concessions if it is given that 50 % of those not getting a fee waiver are eligible to get half fee concession ? 
Options: a ) 360 , b ) 280 , c ) 320 , d ) 330 , e ) 350
Output (English): d