A) 3
C) 4
D) 6
cost price of 6 tofees = 1 rs
He must sell at 20%gain
We know formula
=> S.P = (100 +gain / 100) x C.P
=>(100+20/100) x 1
=>120/100
=>6/5 rupees
selling price of 6 toffees must be 6/5 rs for 20%gain
=>selling prcie of 1 tofee for 20%gain
=> 6×5/6
=>30/6
=>5 rs