#include
void main()
{
const double price = 3.50;
const double discount1 = 0.05; /* Discount for more than 10 */
const double discount2 = 0.1; /* Discount for more than 20 */
const double discount3 = 0.15; /* Discount for more than 50 */
double total = 0.0;
int quantity = 0;
printf("Enter the number that you want to buy:"); /* Prompt message */
scanf(" %d", &quantity); /* Read the input */
total = quantity * price * ( 1.0 - (quantity>50 ? discount3 :
(quantity>20 ? discount2 : (quantity>10 ? discount1 : 0.0))));
printf("The price for %d is $%.2lf\n", quantity, total);
}