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

Janine used the calculations shown to determine how much she would spend on 245 pencils-example-1
User Tim Jones
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1 Answer

23 votes
23 votes

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

Janine used the calculations shown to determine how much she would spend on 245 pencils-example-1
User Ottilie
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