Adding Monthly Installments Under Price Value In Product Page CS CART v3

I need a developer to write a piece of coding for me in the back end of our CS CART v3 website, to calculate a monthly payment on the product page so that customers can see how much it will cost a month if the would like to purchase a product on credit.

The interest rate is 22.1%

The period is 12 months

The Formula I would like you to use is:

PMT = [r X PV] / [ 1 - (1 + r)^-n]

Where PMT: Payment

R: Rate for a period

PV: Present Value

n: No. of Periods

For instance

R199.99

PMT = [0.221/12 X(199.99)] / [1 - (1+(0.221/12))^-12]

PMT=R18.73

I have attached an image to show what it should look like.

CSS PHP Архітектура ПЗ

ID Проекту: #6318012

Про проект