How to use the caculator HP 10 to do this question?

15. The Winston Co. is considering two mutually exclusive projects with the following cash flows. The incremental IRR is and if the required rate is higher than the crossover rate then project should be accepted. Project A Project B Year Cash Flow Cash Flow -$75,000 -$60,200 $30,000 $25,000 $35,000 $30,000 $35,000 $25,000 a. 13.94%; A b. 13.94%; B c. 14.65%: A D. 14.65%; B e. 15.86%; A