stuck on this engineering econ probelm

Engineering Economics (1) Homework: Chapter 4 - Deferred Annuities and Gradient Serie Save Score: 0 of 1 pt HW Score: 12.5%, 1 of 8... 2 of 8 (1 complete) Problem 4-72 (algorithmic) EQuestion Help Find the value of the unknown quantity, Po, that establishes equivalence in the cash flow diagram below. Suppose i 15% per year. Use an annuity factor and a uniform gradient factor in your solution. $2.500 $1,500 $1,300 $1,100 $900 $900 $900 $900 $900 0 2 4 5 6 7 9 10 End of Year Po ? P $(Round to the nearest dollar.)