A direct relationship requires a change in the same direction of both variables, answer c.
To find new price after discount we are going to find 10% of $13,999.00, then subtract the discount amount from $13,999.00.
13,999.00 × ¹⁰/₁₀₀ = $1,399.90
13,999.00 - 1,399.90 = $12,599.10
Therefore, new price = $12,599.10