Choose how Autopay payments are split (4 months, 8 months etc.)

Would it be possible to have an option to select how many months/payments a family would like to split their payments into? It would be easier for the dance studio and parents could see exactly how much they will be charged every month. Right now only percentages are available which make it difficult.

For example, I will be separating payments into 8 months so I have to charge 13% for 7 months and the remaining 9% for the last month since it cannot be split evenly. It's caused a lot of confusion for my families.