# Sam is mailing packages. Each small package costs him $2.70 to send. Each large package costs him$4.30. How much will it cost him to send 4 small packages and 1 large package?

Let $s$ = the cost of a small package and
$l$ = the cost of a large package
$4 s + l$
Substitute s=$2.70 and l=$4.30
=4($2.70)+($4.30)
=\$15.10