Mark and Billy find a set of power tools with a price tag of D dollars. They also find a pair of water skis at the cost of D plus $15 and also some jewelry with the cost of D -5 dollars each product has a discount the power tools are 15% off the water skis are 25% off and the jewelry is 10% off. The two expressions in terms of D to show how much Mark and Billy would pay if they buy a set of power tools.
The price Mark and Billy would pay for the power tools, after a 15% discount, would be:
0.85D
The price Mark and Billy would pay for the water skis, after a 25% discount, would be:
0.75*(D + 15) = 0.75D + 11.25
The price Mark and Billy would pay for the jewelry, after a 10% discount, would be:
0.9*(D - 5) = 0.9D - 4.5
Therefore, the total amount Mark and Billy would pay if they buy a set of power tools would be:
0.85D + 0.75D + 11.25 + 0.9D - 4.5
= 2.5D + 6.75