What is the present value of $2,125 per year, at a discount rate of 8 percent, if the first payment…

What is the present value of $2,125 per year, at a discount rate of 8 percent, if the first payment is received 7 years from now and the last payment is received 21 years from now? 

Can anyone show me how to solve this type of cash flow problem? Problem. Please Help!