9514 1404 393
Answer:
$86
Step-by-step explanation:
Since the interest varies directly, doubling the rate will double the interest.
The interest is $86 when the rate is 8%.
35
4 x 15 = 60
-4 x 5 = - 20
-1 x 5 = -5
60 - 20 - 5 = 35
