/*
 * Compute the actual cost of buying 23 items at $13.95.  We assume an
 * 18% discount rate and a 7.5% sales tax.
 */
#include <stdio.h>
#include <stdlib.h>

int main()
{
  int    items;                    /* # of items bought */
  double list_price;               /* list price of item */
  double discount_rate;            /* discount percentage */
  double sales_tax_rate;           /* sales tax percentage */
  double total_price;              /* total price of all items */
  double discount_price;           /* discount price of all items */
  double sales_tax;                /* amount of sales tax */
  double final_cost;               /* cost including sales tax */

  items = 23;
  list_price = 13.95;
  discount_rate = .18;
  sales_tax_rate = .075;

  total_price = items * list_price;
  discount_price = total_price - total_price * discount_rate;
  sales_tax = discount_price * sales_tax_rate;
  final_cost = discount_price + sales_tax;

  printf("List price per item: %f\n", list_price);
  printf("List price of %i items: %f\n", items, total_price);
  printf("Price after %f%% discount: %f\n",
         discount_rate * 100, discount_price);
  printf("Sales tax at %f%%: %f\n",
         sales_tax_rate * 100, sales_tax);
  printf("Total cost: %f\n", final_cost);

  return EXIT_SUCCESS;
}