PROBLEM 3:
Write a C Program for to calculate the water bill given the cubic feet of water used for Eureka Water Company, which charges the homeowner one of the following:
A flat rate of $15.00 for usage up to and including 1000 cubic feet.
$0.0175 per cubic foot for usage over 1000 cubic feet and up to and including 2000 cubic feet.
$0.02 per cubic foot for usage over 2000 cubic feet and up to and including 3000 cubic feet.

A flat rate of $70.00 for usage over 3000 cubic feet.

CODE:
#include<stdio.h>
main ()
{

    int flat_size=0;
    float price=0.0;
    printf("Enter your flat size:");
    scanf("%d",&flat_size);
    if(flat_size<=15)
    {
        printf("your flat rate is 15$");
    }
    else if(flat_size>1000 && flat_size<=2000)
    {
        price=0.0175*flat_size;
        printf("your flat rate is %f$",price);
    }
    else if(flat_size>2000 && flat_size<=3000)
    {
        price=0.02*flat_size;
        printf("your flat rate is %f$",price);
    }
    else
    {
        printf("your flat rate is 70$");
    }
    return 0;

}
Program Output: