Noah bought a quilt online it cost sixteen dollars plus twenty percent shipping and handling what was the total cost

Taking algebra two apex courses and need with these questions

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 jamie pay at the end?

What number is 7 units left of -15?