asap plz ty

Doesnt give me the discounting factor as the complete question is in the picture.

What is the payback period for a project that costs $12,849 today and has positive cash flows of $4,075,$4,761, and $8,160 in years 1 through 3 respectively? (Do not round any intermediate calculations. Rnd your final answer to 2 decimal places and enter it in the box below.)