Question

You want to buy a car. You have $800 for a 20% down payment and need a loan for the remainder of the car's cost. You find a loan with 2.9% interest. How much would the sticker price of the car be?

Answer 1

800 is 20% of what
800 = .20x
800/.20 = x
4000 = x
So, 4000 is the cost of the car.
The interest for the car is 2.9% of 4000.
(.029)(4000) = 116 <-- this is the interest
4000 + 116 = 4116 is the sticker price of the car.
I think I did that correctly, but you might want to wait and get a second opinion.