Answer:
jia's friend should charge $22.33 for the dog washing sevice.
Step-by-step explanation:
It is given that jia's friend provide fog washing service for each dog supplies cost $4 and wage are $5 .
A special room and equipment are needed ,at a cost of 400$ per month .
Fixed cost = $400
Variable cost = $4+$5=$9
Total cost of 30 dogs is
[tex]C=400+9(30)=670[/tex]
Let x be the amount charged by jia's friend for the dog washing sevice. So, total revenue for 30 dogs washing service is
[tex]R=30x[/tex]
Formula for profit:
[tex]Profit=Revenue-Cost[/tex]
[tex]Profit=30x-670[/tex]
For break even condition, the profit is 0.
[tex]0=30x-670[/tex]
[tex]-30x=-670[/tex]
[tex]30x=670[/tex]
Divide both sides by 30.
[tex]\frac{30x}{30}=\frac{670}{30}[/tex]
[tex]x=22.33[/tex]
Therefore, jia's friend should charge $22.33 for the dog washing sevice.