C++ salary calculation formula trouble

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C++

hello, I am looking for some assistance in fixing a calculation string in my C++ code.

the issue that I am having is my monthly gross salary is not outputting correctly. I have created my inData.txt file with the following information:

Giselle Robinson Accounting
5600 5 30
450 9
75 1.5

my output should read:

Monthly Gross Salary : $ 5600.00, Monthly Bonus : 5.00%, Taxes : 30.00%
Paycheck : $4116.00

the incorrect output that i am getting is:

Monthly Gross Salary : $ 5880.00, Monthly Bonus : 5.00%, Taxes : 30.00%
Paycheck : $4116.00

I am almost positive that my issue is with my calculation for monthly salary and paycheck. can somebody assist me with fixing this please?

What I have tried:

everything else works and outputs exactly how it should be.

here is my code:

#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
#include <cstdio>

using namespace std;

int main()
{
	ifstream inFile("C:/Users/Student/Desktop/CS265 programming in C++/weekly assignments/week 2 assignment/week 2 assignment/week 2 assignment/inData.txt");
	ofstream outFile("C:/Users/Student/Desktop/CS265 programming in C++/weekly assignments/week 2 assignment/week 2 assignment/week 2 assignment/outData.txt");

	outFile.open("C:/Users/Student/Desktop/CS265 programming in C++/weekly assignments/week 2 assignment/week 2 assignment/week 2 assignment/outData.txt");

	if (inFile.is_open())
	{
		cout << "File opened\n" << endl;
	}
	else
	{
		perror("File Failed to open");
		return 1;
	}

	//Setting the decimal value to .00

	{
		std::cout << std::fixed;
		std::cout << std::setprecision(2);
	}

	string firstName,
		lastName,
		department;

	double monthlySalary,
		monthlyBonus,
		taxes,
		payCheck,
		distanceTraveled,
		travelingTime,
		coffeeCost,
		coffeeSales,
		averageSpeed;

	int cupsSold;

	//File Input

	inFile >> firstName >> lastName >> department;
	inFile >> monthlySalary >> monthlyBonus >> taxes;
	inFile >> distanceTraveled >> travelingTime;
	inFile >> cupsSold >> coffeeCost;

	//Calculate the monthly salary

	monthlySalary = monthlySalary + (monthlyBonus / 100 * monthlySalary);
	payCheck = monthlySalary - (taxes / 100 * monthlySalary);
	averageSpeed = distanceTraveled / travelingTime;
	coffeeSales = cupsSold * coffeeCost;

	//Output to file

	outFile << "Name : " << firstName + ' ' + lastName << ", Department : " << department << endl;
	outFile << "Monthly Gross Salary : $ " << monthlySalary << ", Monthly Bonus : " << monthlyBonus << "%, Taxes : " <<taxes << "%" << endl;
	outFile << "Paycheck : $" << payCheck << endl;
	outFile << "distance traveled : " << distanceTraveled << " miles" << ", traveling time: " << travelingTime << ", hours" << endl; 
	outFile << "Average Speed : " << averageSpeed << " mph" << endl;
	outFile << "number of coffee cups sold: " << cupsSold << ", cost: $ " << coffeeCost << " per cup " << endl;
	outFile << "Sales Amount : $" << coffeeSales << endl;

	//close files

	inFile.close();
	outFile.close();

	cout << "Name : " << firstName + ' ' + lastName << ", Department : " << department << endl;
	cout << "Monthly Gross Salary : $ " << monthlySalary << ", Monthly Bonus : " << monthlyBonus << "%, Taxes : " <<taxes << "%" << endl;
	cout << "Paycheck : $" << payCheck << endl;
	cout << "distance traveled : " << distanceTraveled << " miles" << ", traveling time: " << travelingTime << ", hours" << endl;
	cout << "Average Speed : " << averageSpeed << " mph" << endl;
	cout << "number of coffee cups sold: " << cupsSold << ", cost: $ " << coffeeCost << " per cup " << endl;
	cout << "Sales Amount : $" << coffeeSales << endl;

	cin.get();

	return 0;
}