Raj placed $8000 in saving account

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Raj placed $8000 in saving account. For how long can $800 be withdrawn from the account at the end of every month starting one month from now if interest is 4.58% compounded monthly?

 

We've learned two formulas, I don't know how to alter them to calculate this.

?FV=PMT×(1+R)×(((1+R)n−1)/R)?

?PV=PMT×(1+R)×((1−(1+R)−n)/R)?

Please explain your answer Thank you :)