Excel Maths function to PHP

Question

I am having a problem converting an excel maths function to a php function, I have the majority of the code correct, however the last bit I cannot seem to get correct.

This is the excel function

=SUM((0.75*200000)*(1+(0.04/12))^(5*12))-(((0.04/12)*(0.75*200000)/((1-(1+(0.04/12))^(-(30*12)))))/(0.04/12))*((1+(0.04/12))^(5*12)-1)

This is my PHP code

((0.75*200000)*(pow(1+(0.04/12),(5*12)))) - (((0.04/12)*(0.75*200000) / (1-(pow(1+(0.04/12),-(30*12)))))/(0.04/12)) * (pow((1+(0.04/12)),(5*12)-1)) ;

At the moment my PHP code is getting the answer of -78,294.13 I need to get 135,671

I believe that the following code is wrong, but I cant seem to figure out why.

(pow((1+(0.04/12)),(5*12)-1))

Any help would be much appreciated.

Answer 1

You have error in PHP calculation:

... * (pow((1+(0.04/12)),(5*12)-1)) ;

should be:

... * (pow((1+(0.04/12)),(5*12))-1) ;