### Home > CC2MN > Chapter 8 > Lesson 8.1.6 > Problem8-75

8-75.

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.

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

First set up the proportion.

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

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

$7.5$

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

$15$ letters for $\6.75$