Given:

$-10\%$ Interest rate

End of year $0$: Net Cash Flow $$0$

End of year $1$: Net Cash Flow $$300$

End of year $2$: Net Cash Flow $-$$$500$

End of year $3$: Net Cash Flow $$700$

End of year $4$: Net Cash Flow $$400$

End of year $5$: Net Cash Flow $$300$

End of year $6$: Net Cash Flow $-$$$400$

End of year $7$: Net Cash Flow $$900$

Find PW$,$ FW and AW