i need help with this question

Question

Sue and Frank plan to buy their son a truck as a graduation present. They can afford to spend no more than $15 000. A dealership has a sale on a truck for 15% off the listed price of $17 500. Can Sue and Frank get the truck for their son? 

Answer 1

15% off means you pay 100-15 = 85% of the price

$17,500 x .85 = $14,875 is the discounted price

With a $15,000 budget they can buy the truck and have $125 left over

15% of $17,500 is 10% off plus 5% off

10% is moving the decimal point to the left one digit: $1,750

5% is half of 10% = 1/2 of $1750 = $875

17500- 1750 - 875 = $14875 < $15000