The Zwerling family installed central air conditioning in their house this summer. They are comparing the electric

Question:

The Zwerling family installed central air conditioning in their house this summer. They are comparing the electric bills of this summer and last summer. The data is shown.
The Zwerling family installed central air conditioning in their house

a. What was the total electric bill this summer?
b. What was the total electric bill last summer?
c. Did the bill increase more or less than 50%?

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