How much should I sell this particular painting for?

So I was asked if I was selling a painting which measures 16“X19” It’s an abstract-expressionist piece. I’m a first time seller and I want to continue selling. How much do you think is fair? It’s painted on wood and it’s acrylic. I poured a lot of energy and emotion into the painting. I feel at the very least I should set the price offer at 40$USD. However, do you think I’m selling myself short?

Again, the person merely asked if it’s for sale, and I want to push my work out there at the same time maintain my works integrity.

Thanks for your opinions!