Answer
domain: $\left\{\text{20 hours, 30 hours, 40 hours}\right\}$
range: $\left\{\text{\$200, \$300, \$350, \$425}\right\}$
Work Step by Step
The domain is the set of the first coordinates while the range is the set of second coordinates.
Thus, the given relation has:
domain: $\left\{\text{20 hours, 30 hours, 40 hours}\right\}$
range: $\left\{\text{\$200, \$300, \$350, \$425}\right\}$
This relation is not a function.