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Question

I am calculating the rate of return, for a loan made to a friend that wants to pay $600 in 3 years from now if I loan them $500 today. I need to find the interest rate the friend is offering, which I know the anser should be 6.3%, but I am unable to get that answer with the formulas I have been using. I have used PV(1+i)n=FV, I=PxRxT, FV=PV= (1+i)n and none of them have gotten me to my expected end. Can you please tell me whhich formula must be used to find the value, and please show the work?