Solve each problem.

The Friendly Bob Loan Company gives each applicant a rating, $t,$ from 0 to 10 according to the applicant's ability to repay, a higher rating indicating higher risk. The interest rate, $r$, is then determined by the function $r=0.02 t+0.15$

a) If your rating were $8,$ then what would be your interest rate?

b) Sketch the graph of the equation for $t$ ranging from 0 to 10