RAVI BUY 10 TOFFEES. { LCM of 5 and 2 = 10 ) C.P. of 2 toffees = $ 1 C.P. of 10 toffees = $ 5 C.P. of 5 toffees = $ 1 S.P. of 10 toffees = $ 2Loss = C.P. of 10 toffees - S.P. of 10 toffees = 5 - 2 = $ 3