c program to calculate telephone bill

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C Program to calculate telephone bill based on phone calls

Program to calculate the telephone bill based on the following conditions :

1. (0-200) first 200 calls are free

2. (200-500) Calls between 200 to 500 will be charged 1 /Call.

3. (500+) In this case first 200 call free (200-500) 1re/call and (500+) will be 2/call

4. 200 is rental in the final bill

For Example :600 calls will be calculated as (200*0 + 300*1 +100*2 + 200 ) = 700 (total bill)

#include <stdio.h>
#include <conio.h>
void main()
{
    int calls, bill=0;
    printf("Enter the number of calls");
    scanf("%d",&calls);
             
      if(calls<=200)  // first if condition for free calls upto 200
        bill=0;
      if(calls>200&& calls<=500)  // if condtion for 200 calls free +1 re/call on rest calls
        bill=200*0+ (calls-200)*1;
      if(calls>500)
        bill=200*0+300*1+(calls-500)*2; // if calls 200 free+ (200-500)->1Re/Call (500+)->2Re/call
    bill=bill+200; // 200 rental is added.
    printf("the final bill =%d",bill);
}