I can not get the same Put price as the right answer does

Course Name: Options Trading Strategies In Python: Intermediate, Section No: 7, Unit No: 5, Unit type: Notebook

# Since interest rate is considered 0%, 35 is added to the nifty price to get the Nifty December futures price._

What is the rationale behind? Where is the 35 comes from and how it would change if interest rate would be e.g., 4%