Compound Annuity Calculator Compound & Annuity?

Compound & Annuity? - compound annuity calculator

Philip began their work in a factory 18th Every month, you pay $ 25 to a value of 7.1% in net interest income. If this trend continues, until 60 years past 42 years, as have a lot of money saved.

Following the answer, what formula should I use?