I would like to know how to work this formula the answer is 27,508. Apr 4% $75.00 a month how much will I have in 20 years.0412 raised to 12x20-1...

I would like to know how to work this formula the answer is 27,508.10. Apr 4% $75.00 a month how much will I have in 20 years. 1+0.04÷12 raised to 12x20-1 divided by 0.04. the formula with out the numbers. 1+APR÷N raise to (NY) -1 ÷ Apr÷n