In calculation of Option price n Future price,at present which interest rate use 7% or 10%?

General
2

You can take the 91 day t-bill rate as indicated on the RBI site - check under market trends -

https://www.rbi.org.in/

1 Like
3

Thank’s Sir,
one more doubt, in future price formula.
Future = Spot*e^(rt). we use e=2.718 is this fix?
What is reflect e and how can we got 2.718.

4

Yup, the value of e if fixed. It is a mathematical constant.