a vendor bought toffees at 6 for a dollar . how many for a dollar must he sell to gain 20 % ?
"c 5 c . p . of 6 toffees = $ 1 s . p . of 6 toffees = 120 % of $ 1 = $ 6 / 5 for $ 6 / 5 , toffees sold = 6 . for $ 1 . toffees sold = 6 * 5 / 6 = 5"
multiply(6, add(const_1, divide(20, const_100)))