Repayment calulations

[kashh83]

Hi All,
I am trying to calculate the monthly repayments for a buy now pay in installment/later model, however I kind of not sure if I am doing it right.

If my sale is 10000 on Month 1 and a 25% deposit is paid where the annual interest is 5% .. how would I calculate the monthly payment …

And also, for month two if my sales are 12000 and I also want to show month 2’s repayment from month 1 and the repayment for the second month’s sale
Hope it makes sense.