how to calculate Payback using PERCENTRANK?

Time period $01234567$

Cash flow $-$$$575$ $$190$ $$190$ $$190$ $$190$ $$190$ $$190$ $$0$

Cumulative cash flow $-$$$575-$$$385-$$$195-$$$5$ $$185$ $$375$ $$565$ $$565$

Intermediate calculation for payback $-0\mathrm{.}330$

Payback using intermediate calculations $2\mathrm{.}670$

Payback using PERCENTRANK Ok because cash flows follow normal pattern.