Added billing software

Electricity billing software/README.md

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+# Electricity Billing Software
+
+The main objective of the Electricity Billing System is to manage the details of Electricity, Bill.
+
+## I have used:
+
+C-Language
+
+## Working
+It's simple to use. Firstly enter customer name, customer adderess, customer ID, Meter no. & Unit consume.\
+Then, it will automatically generate a E-Bill.
+
+
+
+## Screenshot
+![dataset1](images/dataset1.png)

Electricity billing software/electricity_billing.c

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+#include<stdio.h>
+#include<conio.h>
+
+
+int main()
+{
+    int meter_no,customer_id;
+    float unit,unit_consume,amount,rate;
+    char name[30],adderess[30];
+
+    printf("customer name:-");
+    scanf("%[^\t\n]",name);
+    fflush(stdin);
+
+    printf("customer adderess:-");
+    scanf("%[^\t\n]",adderess);
+    fflush(stdin);
+
+    printf("customer ID:-");
+    scanf("%d",&customer_id);
+    fflush(stdin);
+
+    printf("meter no:-");
+    scanf("%d",&meter_no);
+    fflush(stdin);
+
+    printf("unit consume:-");
+    scanf("%f",&unit_consume);
+    fflush(stdin);
+
+    if(unit_consume<=100)
+    {
+        rate=5;
+        amount=rate*unit_consume;
+    }
+    else if(unit_consume<=200)
+    {
+        rate=7;
+        amount=500+(unit_consume-100)*7;
+    }
+    else if(unit_consume<=400)
+    {
+        rate=9;
+        amount=1900+(unit_consume-200)*9;
+    }
+    else if(unit_consume<=700)
+    {
+        rate=11;
+        amount=4600+(unit_consume-400)*11;
+    }
+    else
+    {
+        rate=15;
+        amount=7900+(unit_consume-700)*15;
+    }
+
+    printf("\n");
+    printf("\n*********************************************************************************************************************");
+    printf("\n\t\t\t\t\t\tE-BILL");
+    printf("\n*********************************************************************************************************************");
+
+    printf("\ncustomer name:-%s",name);
+    printf("\ncustomer adderess:-%s",adderess);
+    printf("\nmeter no:-%d",meter_no);
+    printf("\nunit consume:-%f",unit_consume);
+    printf("\n---------------------------------------------------------------------------------------------------------------------");
+    printf("\n\n rate/unit");
+    printf("\n Rate<=100 is Rs.5=500");
+    printf("\n Rate>100 and <=200 is Rs.7 =700");
+    printf("\n Rate>200 and <=400 is Rs.9= 900");
+    printf("\n Rate>400 and <=700 is Rs.11= 1100");
+    printf("\n Rate>700 is Rs.15= 1500");
+    printf("\n\n\t Rate/Unit is:-%.2f",rate);
+    printf("\n\n\t Total Amount is:-%.2f",amount);
+
+
+    return 0;
+
+}