An investment makes constant annual payments for the next 25 years of $890 with the first payment due at t=1. After this period, payments grow at a...

1. An investment makes constant annual payments for the next 25 years of $890 with the first payment due at t=1. After this period, payments grow at a rate of 2% annually and are paid in perpetuity. What is the present value of the investment's cash flows at an annual discount rate of 8.0%?

Answer: $11,710 

I have no idea how to calculate this one?

Pls give me correct explanation how to calculate