C Program to Calculate Sales Tax

Overview

In this post, we will develop a C program to Calculate the Sales tax of a purchased product. However, the shop runs some discounts on household items that need to be calculated before the Sales tax computation.

Problem Statement

Write a C program to calculate the SalesTax, Discount, and Total Price. Below are the program rules:

Program Rules:

Sales Tax on Household Items is 12%. Household items have a discount of 10%

Sale Tax on all other items in the shop is 18%
If there is a discount, apply the discount before SalesTax.

Display the purchase cost, discount amount(household items), sales tax amount, total price.

C Program

#include
/**********************************************************
 Description: C Program to calculate SalesTax
 www.TestingDocs.com
***********************************************************/
// Program Rules:
// Assume SalesTax = 18%
// If HouseHold Item = 12% - House hold items have discount of 10%
// Apply Discount before SalesTax.
void main()
{
 double productPrice, salesTax;
 double houseHoldDiscount;
 double Total,discountedTotal ;
 double salesTaxPercent,discountPercent;
 char hItem;
 printf("Enter the price of purchased Product :$ ");
 scanf("%lf", &productPrice);
 printf("Is the product household item?[Y/N] :");
 scanf(" %c", &hItem);
 printf("-----------------------------------------------------\n");

 printf("Total purchases: $ %.2lf \n", productPrice);
 if(hItem =='Y' || hItem =='y')
 {
 //Household ITems
 houseHoldDiscount = productPrice*0.10;
 printf("HouseHold Discount (10%%) : $ %.2lf \n", houseHoldDiscount);
 discountedTotal = productPrice - houseHoldDiscount;
 printf("Total After Discount : $ %.2lf \n", discountedTotal);
 salesTax = discountedTotal*0.12;
 printf("Sales Tax(12%%) : $ %.2lf \n", salesTax);
 Total = discountedTotal + salesTax ;
 printf("Grand Total : $ %.2lf \n", Total);
 }
 else
 {
 // Others - Non-Household Items
 salesTax = productPrice*0.18;
 printf("Sales Tax(18%%) : $ %.2lf \n", salesTax);
 Total = productPrice + salesTax ;
 printf("Grand Total : $ %.2lf \n", Total);
 }
 printf("-----------------------------------------------------\n");
}

Sample Output

 

Testcases

Happy path Testcase 1:(Household item)

Enter the price of purchased Product :$ 200
Is the product household item?[Y/N] :Y
—————————————————–
Total purchases: $ 200.00
HouseHold Discount (10%) : $ 20.00
Total After Discount : $ 180.00
Sales Tax(12%) : $ 21.60
Grand Total : $ 201.60
—————————————————–

Happy path Testcase 2:( Non-household item)

Enter the price of purchased Product :$ 220
Is the product household item?[Y/N] :N
—————————————————–
Total purchases: $ 220.00
Sales Tax(18%) : $ 39.60
Grand Total : $ 259.60
—————————————————–