82% written as a fraction in simplest form

Which number produces a rationale number when multiplied by 1/5

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each,and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent.how much did jame pay at the end?

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)