Answer: He earned $40.
Step-by-step explanation: So at the begging he started with $12. When he washed cars, he made some money off of that. At the end, he had $52. So now, you need to do 52-12, which equals 40. So, he earned $40 washing cars. Hope that helps.
If you thought that was helpful, say thanks and give me a good rating plz!
