Write a C program to calculate an electricity bill

Description: Take the units of electricity used as input and calculate the bill with these rates:

• First 100 units: Rs 5 per unit
• Next 100 units (101 to 200): Rs 7 per unit
• Above 200 units: Rs 10 per unit

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C program to calculate the electricity bill

#include <stdio.h>

int main(void) {
    int units;
    float bill;

    printf("Enter units used: ");
    scanf("%d", &units);

    if (units <= 100) {
        bill = units * 5;
    } else if (units <= 200) {
        bill = 100 * 5 + (units - 100) * 7;
    } else {
        bill = 100 * 5 + 100 * 7 + (units - 200) * 10;
    }
    printf("Electricity bill = Rs %.2f\n", bill);
    return 0;
}

Output:

How it works

• For 250 units: first 100 units cost 500, the next 100 units cost 700, and the last 50 units cost 500.
• Total is 500 + 700 + 500 = 1700.

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