Proposals L and K Each Cost $500,000, Have 6-Year Lives

Proposals L and K each cost $500,000, have 6-year lives, and have expected total cash flows of $750,000.Proposal L is expected to provide equal annual net cash flows of $125,000, while the net cash flows for Proposal K are as follows:
​ $$\begin{array} { l r } \text { Year 1 } & \$ 250,000 \\\text { Year 2 } & 200,000 \\\text { Year 3 } & 100,000 \\\text { Year 4 } & 90,000 \\\text { Year 5 } & 60,000 \\\text { Year 6 } & 50,000 \\& \underline { \mathbf { \$ 75 } 0,000 } \\\hline\end{array}$$ ​
Determine the cash payback period for each proposal.