The local utility company averages rates to determine a standard monthly charge for area businesses. If you are charged $150 for the month of July, $205 for the month of August and $178 for the month of September, what is the average charge for this period of time?Round to the nearest dollar

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The average of 3 numbers is their total divided by 3.
  (150 +205 +178)/3 ≈ 178.67

Rounded to the nearest dollar, the average charge for the period is $178 per month.