How to calculate it?

Solstice Co. is considering a project that would require an investment of $343,000 and would last for 8 years. The incremental annual revenues and expenses generated by the project during those 8 years would be as follows: The scrap value of the project's assets at the end of the project would be $23,000. The payback period of the project is closest to: A 3.2 years. B 5.1 years C 3.0 years D 4.8 years