Question

Make a program that calculates the total of a retail sale. The program should ask the user for the following: the retail price of the item being purchased and the sales tax rate. Once the information has been entered, the program should calculate and display the following: the sales tax for the purchase and the total sale.

Answer 1

CODE IN C++->

#include <iostream>
#include <iomanip>

int main()
{
    // ask user for retail price of item purchased
    std::cout << "please enter the retail price of item purchased: " ;

    // read the user input into a variable
    double retail_price ;
    std::cin >> retail_price ;

    // ask user for sales tax rate
    std::cout << "please enter the sales tax rate as a percentage: " ;

    // read the user input into another variable
    double percent_sales_tax ;
    std::cin >> percent_sales_tax ;

    // if the retail price and sales tax rate are positive values
    if( retail_price > 0 && percent_sales_tax > 0 )
    {
        // compute sales tax amount
        const double sales_tax_amount = retail_price * percent_sales_tax / 100.0 ;

        // calculate total amount
        const double gross_amount = retail_price + sales_tax_amount ;

        // display on screen the sales tax amount for purchase and the total.
        std::cout << std::fixed // fixed point format,
                  << std::setprecision(2) // with two digits after the decimal point
                  << "sales tax amount: " << sales_tax_amount << '\n'
                  << "    total amount: " << gross_amount << '\n' ;
    }

    else std::cout << "there was an error in the data that was entered.\n" ; // invalid input
}

OUTPUT->

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