we know that
A unit rate is a ratio between two different units with a denominator of one
so
the rate [tex] \$108 [/tex] in [tex] 6 [/tex] weeks is not a unit rate
To find the unit rate divide [tex] \$108 [/tex] by [tex] 6\ weeks [/tex]
[tex] \frac{108}{6} = 18\ \frac{dollars}{week} [/tex]
therefore
the answer is
The unit rate is [tex] 18\ \frac{dollars}{week} [/tex]
