Practice!

Sample Problem

The average cost of a camera, a phone, and a printer is $307. If the camera costs $281 and the phone costs $324, how much does the printer cost?

  dollars

Solution

The formula for an average: Average = sum ÷ number of parts

The total cost of three items: 307 × 3 = 921

Thus, the cost of the printer: 921 – 281 – 324 = 316