Answer: a) 780.06
a)130.06
Explanation:
Given: The cost price of mountain bike = $650
The down payment on purchasing mountain bike = 75% of $650
Therefore, Down payment=

He will make 12 payments of $24.38 each.
Total monthly payments =

The total amount paid = Down payment + Total monthly payments

The finance charge = Total amount paid - Cost price

Hence, The total paid (including down payment) is $780.06 and the finance charge in dollars is $130.06.