Evan purchased a boat for $8825. he made a down payment of $2500. he applied for a three-year installment loan with an interest rate of 10.2%. what is the total cost of the boat after three years

The present worth of the boat is $8825. The interest rate is 10.2% and it's not stated whether or not the interest is nominal, so we assume it's annual and effective. We use the formula:
F = P (1 + i)^n
where F is the future worth
P is the present worth
i is the effective annual interest rate
n is the number of years

Substituting:
F = 8825(1 + 0.102)^3
F = 11810.26

The future worth of the boat is 
$11,810.26