Final answer:
To find the net earnings of the car wash, subtract the amount spent on supplies from the amount earned.
Step-by-step explanation:
In order to find the net earnings of the car wash, we need to subtract the amount spent on supplies, $225.98, from the amount earned, $82.75.
Net Earnings = Amount Earned - Amount Spent on Supplies
Net Earnings = $82.75 - $225.98
Net Earnings = - $143.23
The net earnings of the car wash were -$143.23. Therefore, the correct answer is Option C: $143.23.