A long distance telephone company charges $5 per month plus $0.05
for each minute of a long distance phone call.
Time (hours) 0 1 2 3 4 5 6 7 8 9 10
Cost (dollars) $5 $8 $11

If a customer makes 4 hours of long distance calls in a month, what
will be the cost of the bill?
a. $18 c. $15
b. $17 d. $20