### Home > CC3 > Chapter 1 > Lesson 1.2.2 > Problem1-58

1-58.

Mr. Wright was making a table to figure out how much it costs to send a certain number of regular letters through the mail. Use proportional reasoning to complete his table at right. Homework Help ✎

 Number of Letters Cost of Stamps 10 $4.50 2$0.90 $6.75 7 1 500$18.90

First set up the proportion.

$\frac{2 }{0.9 } = \frac{n}{6.75}$

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

What did you multiply $0.90$ by to get $6.75$?

$7.5$

$15$ letters for $\6.75$