Emily buys a toaster during the sale off for 10% off if ellen pays 36$ what was the original price

What properties allow transformation to be used as a problem solving tool

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?

Me. i can't figure out this question. give an explanation too. .