Question

The Hydro water department has a monthly service charge of $10.60 and a volume charge of $2.05 for every 100 cubic feet of water.

The total monthly cost is equal to the service charge plus the charge for the volume used during the month. If we let x represent the number of cubic feet of water (in hundreds) and y represent the total monthly cost, then we have:
total monthly cost = volume charge + service charge
y = 2.05x + 10.60

If the Johnson family used 200 ft3 less water this month than last month, then they can expect

Answer 1

a. an increase in their water bill of $4.10.
b. a decrease in their water bill of $4.10.
c. an increase in their water bill of $21.20.
d. a decrease in their water bill of $21.20.

Answer 2

compute \[2.05\times 200\] it will be that much less