String Manipulation - Finding and Getting Text

I have two tasks to do:

1. "NINE HUNDRED EIGHTY-NINE Rupees NINETY Paise" --> what I want to do is find "Rupees" from the text and delete starting from "Rupees" until the end of the text.

2. "989.90" ---> I want to find the position of "." and get everything beyond that point so i can get just "90"

Thanks! Credits will be given