Question 1060263
If the additional deposits are made at the END of the moth:
PMT*(((1+r/n)^nt-1)/(r/n))
:
If the additional deposits are made at the BEGINNING of the month:
PMT*(((1+r/n)^nt-1)/((r/n)*(1+r/n)))
:
Plug in your numbers and solve. For solving, remember PEMDAS (Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction)