Cost of an oil change is $18.00 with a 70% markup

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?

For each proportion find the unknown number x 1/5/8=×/15

What is the difference between the equations of a vertical and a horizontal line?