How many hours do u need sleep when u are a adult

Kevin has just finished paying off his loan. he was assessed a service charge of $422. he paid off the principal and the interest by making weekly payments of $36.13 for four years. if the principal was $7,150, how much did kevin pay in finance charges, to the nearest dollar? a. $498 b. $365 c. $422 d. $787

Can someone tell me if this is perpendicular? !

[tex]5 \times1 \frac{12}{13} [/tex] me