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4-48.

First set up the proportion.

What did you multiply 0.68 by to get 5.10?

7.5

15 letters for $5.10

Multiply 2 by 7.5 to get the number of letters. Repeat this strategy for all of the blanks within the table.

Use the eTool below to help you with this problem.
Click the link at right for the full version of the eTool: AC 4-48 HW eTool