need help with C and D . keep getting it wrong

Wil Brothers, a game manufacturer, has a new idea for an adventure game. It can market the game either as a traditional board game or as an interactive DVD, but not both Consider the following cash flows of the two mutually exclusive projects for the company. Assume the discount rate is 8 percent. Year Board Game DVD 0 -$1,250 $2,800 1 700 1,800 2 1,000 1,580 3 220 850 a. What is the payback period for each project? (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) b. What is the NPV for each project? (Do not round intermediate calculations and round your answers to 2 decimal places, e.g., 32.16.) c. What is the IRR for each project? (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) d. What is the incremental IRR? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g. 32.16.) a. b. Board game DVD Board game DVD Board game DVD Incremental IRR $ $ 1.54 years 1.63 years 430.07 895.88 24.35% 23.36 % C. d. 22.55 X %