Question

The Hydro water department has a monthly service charge of $10.20 and a volume charge of $2.21 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 = 2.21x + 10.20

If the Johnson family used 300 ft3 more water this month than last month, then they can expect
A. a decrease in their water bill of $6.63.
B. a decrease in their water bill of $30.60.
C.an increase in their water bill of $6.63.
D. an increase in their water bill of $30.60.

Answer 1

Answer:

C

Step-by-step explanation:

Let Johnson family used water in last month be 100ft^3

So, ,, ,, ,, ,, ,, this ,, is 400ft^3

Total monthly cost for last month=$10.20+$2.21=$12.41

,, ,, ,, ,, this ,, =$10.20+($2.21×4)=$10.20+$8.84=$19.04

Total monthly cost for this month is greater than total monthly cost for last month.

Amount of increase=$19.04-$10.20=$6.63

If the Johnson family used 300 ft3 more water this month than last month, then they can expect C.an increase in their water bill of $6.63.

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Answer 2

Answer:

an increase in their water bill of $6.63.

Have a good day.