Hi
It's pleasure to meet you.
Yes calculation is very simple.
Can you please tell me, do you want to implement this in already developed application or only want that functionality from me ?
if you have already build application then please share the link with me.
I am certified full stack developer and working from last 7 years for clients from all over the world in variety of industries including following :
Hospitality, marketing, real estate, retail, eCommerce etc.
I can deliver best product to you.
I am looking forward to chat you.
Thanks
Amit Kumar
PS: Please let me know, if you want to see some of my recently designed/developed Websites.