# C++ Program to Find Total Cost of Sold Phones Assignment Solution.

## Instructions

Objective
Write a c++ program to find total cost of sold phones in c++.

## Requirements and Specifications

Description: Write a program in BASIC that compute total charges for phones sold and displays this information to the screen.
Problem: The program must prompt the user for the price of a phone. Compute the sales tax for this value, and then display the phone price, the dollar amount of the sales tax, and the total charge for this purchase. Sales tax is calculated as 7% of the price of the phone. Total charge is the price plus the sales tax amount.
After all the data has been entered, display a grand total of number of phones sold, and a grand total of all total charges.
This program must use at least two subroutines.
Source Code
```#include <iostream> float calculate_tax(float price, float TAX) {  return price * TAX; } float calculate_final(float price, float TAX) {  // This function calculates the final price  float tax_price = calculate_tax(price, TAX);  return price + tax_price; } int main() {  // Variable to store total number of phones  int N = 0;  // Variable to store grand total  float grand_total = 0.0;  // Define tax value  float TAX = 0.07; // 7%  float tax_price, final_price;  while (true)  {   // Prompt user for price of the phone   std::cout << "Enter price (0 to quit): ";   float price;   std::cin >> price;   if (price == 0)// quit   {    break;   }   else if (price < 0)   {    std::cout << "Please enter a positive value for price." << std::endl;   }   else   {    // Calculate    tax_price = calculate_tax(price, TAX);    final_price = calculate_final(price, TAX);    // Display    std::cout << "Price: \$" << price << std::endl;    std::cout << "Tax (" << TAX * 100 << "%): \$" << tax_price << std::endl;    std::cout << "-------------------" << std::endl;    std::cout << "Total: \$" << final_price << std::endl << std::endl;    N++;    grand_total += final_price;   }  }  // Display info of phones sold  std::cout << "Total phones sold: " << N << std::endl;  std::cout << "Grand total: \$" << grand_total << std::endl; }```