We will have the following:
a) His parents spent:
[tex]2.49\cdot6=14.94[/tex]So they spent $19.94.
b) They will spent the following in rental:
[tex]\frac{150}{8}=18.75[/tex]So, the hourly rate $18.75.
c) We will determine the amount spent:
[tex]182.53-150-14.49=18.04[/tex]So, it would be $18.04.