RyanRyan Street Barber Shop pays $ 30$30 per month for water for the first 12 comma 00012,000 gallons and $ 2.50$2.50 per thousand gallons above 12 comma 00012,000 gallons. Calculate the total water cost when the barber shop uses 8 comma 0008,000 gallons, 13 comma 00013,000 gallons, and 17 comma 00017,000 gallons.

Explanation:

8,000

This amount is below the quantity for which additional charges accrue. The base charge applies: $30.

13,000

This is 1000 gallons more than you get for $30, so costs an additional $2.50. The total water cost is ...

  $30 +2.50 = $32.50

17,000

This is 5,000 gallons more than you get for $30, so costs an additional 5×$2.50 = $12.50. The total water cost is ...

  $30 +12.50 = $42.50

Comment on the water charges

$30 is the same as the cost of 12,000 gallons at $2.50 per thousand. So, the total bill can be figured at $2.50 per thousand, with a $30 minimum.

  8 × $2.50 = $20, so the charge is the minimum, $30

  13 × $2.50 = $32.50

  17 × $2.50 = $42.50

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