WordPress/WooCommerce - add small technical features (calculations etc)

We have an established WordPress/WooCommerce site where we sell cars. We need to add some technical things to the site, and you should easily be able to handle the below.

1. Add monthly cost of car below the price of the car (calculated through formula automatically)
2. Add calculator as per design (customize the financing option through drag/pull)

I will provide designs in pdf