Final answer:
The original cost of the new car was $20,000.
Step-by-step explanation:
To find the original cost, we'll use the formula for calculating the final price after a percentage increase:
Final Price = Original Cost + (Original Cost * Percentage Increase)
In this case, we need to solve for the Original Cost, so we'll rearrange the formula:
Original Cost = Final Price / (1 + Percentage Increase)
Then we substitute the values given:
Original Cost = $28,000 / (1 + 0.40)
Original Cost = $28,000 / 1.40
Original Cost = $20,000
Therefore, the original cost of the new car before the markup was $20,000.