How to prove it equal 8?

How to use order of operation in 20 divide by 4 multiply 5 = 1

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?

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?