Payroll System For Hourly / Fixed Monthly And Commission Paid Workers Of Company

I am doing a program where i have to implement a payroll system into a company for hourly, fixed monthly and commission paid workers. I also have to put the method which i did. the problem is I cant tell if my calculation is wrong or if i am missing a codes some where. The output is not giving me the answer that I was at least expected,

Here is my method:

{
< double total_deduction;>
< total_deduction = gross_pay - deduction;>
< return total_deduction;>
}
< public static double calGrossH(double hours_worked, double pay_rate)>

[Code] .....

I have done a lot researching and have come up with some search with almost the same calculation and I have also asked employees of a company on how they calculated hourly rate, commissions rate and fixed rate for all workers and gotten the same response but for some reason the output is not what it is supposed to output. here is my output.

<
un:>
<please enter the number of employees to be processed 31>
<please enter employee id number 3669>
<please enter employee first name>

[Code] ....

I dont know if I am missing some calculation somewhere or codes been researching and bussing my brains to figure out where is the missing codes or calculation.