I have yet another problem.(adsbygoogle = window.adsbygoogle || []).push({});

Rodolfo paez plans to retire in 20 years he will make 120 equal contributions towards his retirement plan. 10 years after his last contribution he will be making 120 periodical withdrawals of 3500 a month until it reaches 0.the interest in the account is of 10.5. What amount of monthly payments he should be making.

This is the last problem for the test that I'm working on and is definitly the hardest one. I think is quiet easy to approach if I can derive the amount of money in the account after the first 20 years and I imagine that a formula should exist to calculate this amount using the withdrawal amount, frequency and the interest rate, but by god I can't find it. Any help in the right direction would be greatly appreciated.

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# Periodic withdrawal formula

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