Add sum and average into this program to calculate the net pay and then run it

Make the sum and average thier own methods #include

#include

#include

using namespace std;

class payroll$\{$

ifstream fin;

char employeeid$[12]$;

char employeename$[20]$;

char maritalstatus;

int hoursworked,overtime;

double hourlyrate,overtimepay,regularpay,grosspay,taxrate,taxamount,netpay;

void calculategrosspay$()$;

void calculatetax$()$;

void calculatenetpay$()$;

void printheadings$()$;

void printdata$()$;

public: payroll$()$;

~payroll$()$;

void printreport$()$; $\}$;

payroll::payroll$()\{$

fin.open$("$payroll$.$dat"$)$; $\}//$CONSTRUCTOR

payroll::~payroll$()\{$

fin.close$()$; $\}//$DESTRUCTOR

void payroll:: calculategrosspay$()\{$

if$($hoursworked $>40)\{$

overtime $=$ hoursworked $-40$;

regularpay $=$ hoursworked $*$ hourlyrate;

overtimepay $=$ overtime $*($hourlyrate $*1\mathrm{.}5)$;

grosspay $=$ regularpay $+$ overtimepay; $\}//$IF

else grosspay $=$ hoursworked $*$ hourlyrate; $\}//$CALCULATEGROSSPAY

void payroll ::calculatetax$()\{$

if$($grosspay $>=500)$ taxrate $=\mathrm{.}30$;

else if$($grosspay $>200\mathrm{.}00)$ taxrate $=\mathrm{.}20$;

else taxrate $=\mathrm{.}10$;

if$($maritalstatus $==\text{'}$S$\text{'}||$maritalstatus $==\text{'}$s$\text{'})$

taxrate $=$ taxrate $+\mathrm{.}05$;

taxamount $=$ grosspay $*$ taxrate; $\}//$CALCULATETAX

void payroll :: calculatenetpay$()\{$

netpay $=$ grosspay $-$ taxamount; $\}//$CALCULATENETPAY

void payroll::printheadings$()\{$

cout$<>$employeename$>>$employeeid$>>$maritalstatus$>>$hoursworked$>>$hourlyrate$)\{$

calculategrosspay$()$;

calculatetax$()$;

calculatenetpay$()$;

printdata$()$;

i$++$; $\}//$WHILE

$\}//$PRINTREPORT

void main$()\{$

payroll employee;

employee.printreport$()$; $\}//$MAIN