I Have A Finance Question The Current Risk Free Interest Rate Is 5 A Gold Future

I have a finance question.The current risk-free interest rate is 5%. A gold futures and a forward contract have a one-year delivery strike price of $1,450 per oz. The current price of gold is $1,000. What will the change in the value of the futures contract be as a result of a change in the price of gold that causes the value of a forward contract to increase by $3.50? I don’t know how to calculate? Can you show the process?