$13.$ I want to buy a car. I pay $$506$ per month for five years. The quoted APR is $6\mathrm{.}9\%.$ How much did I pay for the car? $14.$ If the best offer was $$548$ per month from the dealership, how much did they want for the car? $15.$ What is the balance on the loan after $2$

$2$

$1$

$$

years, if I made every $$506$ payment on time? $16.$ How much of payment $2$ is interest? How much goes to principal? $17.$ If I make payments of $$580$ per month, how long will it take me to pay off the loan? $18.$ If the quoted APR on my credit card is $18\%,$ what is the effective annual rate I am paying if the compounding period is monthly? Daily?