Question

Janine used the calculations shown to determine how much she would spend on 245 pencils. What's her error?

Answer 1

Janine wrote the rate incorrectly. Using the following rule of three:

The correct rate would be:

`(72)/(1)=\frac{\text{?}}{3600}`

The unit price would be $0.02 , not $0.20. Thereby, she would spend $4.90 , not $69