Thank you for sending work to XXXX. We had a fantastic response with over 300 writers sending in around 700 submissions. The quality of the writing was very high and we had to make some very hard decisions in order to select the 18 submissions eventually chosen for the book.
I'm afraid we haven't kept any of your work on this occasion, but hope that you will be interested in future XXXX submission calls. Please do keep an eye on the website for other writing opportunities.
This is a slightly edited of the rejection email I found in my inbox this morning. It isn't the first and it won't be the last, but would someone help me do the math here? It's early on Saturday morning. What is the percentage acceptance rate, if 18 pieces are chosen from a pool of 700 submissions?