C – While purchasing certain items, a discount of 10% is offered if the quantity purchased is more than 1000. If quantity and price per item are input through the keyboard, write a program to calculate the total expenses.

Following is a program to calculate – the Total Purchase expenses with a discount :

#include <stdio.h>
int main()
{
    float qty, rate, bill;
    printf("Enter the quantity and rate ");
    scanf("%f %f", &qty, &rate);
    bill = qty * rate;
    if (qty > 1000)
    {
        bill = bill * 0.9;
    }
    printf("The total expenses = Rs %f", bill);
}

Explanation:

1. Input Prompt: printf("Enter the quantity and rate: "); prompts the user to enter the quantity and rate.
2. Input Reading: scanf("%f %f", &qty, &rate); reads the input values for quantity and rate.
3. Initial Bill Calculation: bill = qty * rate; calculates the initial bill.
4. Discount Application: if (qty > 1000) { bill = bill * 0.9; } applies a 10% discount if the quantity is greater than 1000.
5. Output: printf("The total expenses = Rs %f", bill); prints the total expenses with two decimal places.