Need advice. How much should I charge for my work? Sewing Machines Parts and Sales in Los Angeles

I made a fleece car seat poncho for my daughter and one of my nieces freinds asked me to make one for her daughter. I like making things but am reluctant to sell because I’m terrible with math. I reluctantly agreed and got a smoking deal on some fleece (75% off on black Friday at joann) I used two yards and it cost me about $5. I spent maybe 5 hours over the course of 3 days working on it. It’s not perfect but it’s not shotty work either. It’s more well made than the one I made for my daughter (I lined the hood, and did a better job with the seams where the hood is attached). So what is a fair price?