Question

# A super class Detail has been defined to store the details of a customer.Define a sub class Bill to compute the monthly telephone charge of the customer as per the chart given below:

```				```
NUMBER OF CALLS     RATE
1-100               only rental Charge
101-200             60 paisa per call +rental charge
201-300             80 paisa per call+rental charge
Above 300           1 rupee per call + rental charge
```
```

# Share code with your friends

Code

```				```
public class Detail
{
String name,address;
long telno;
double rent;
Detail(String n,String a,long t,double r)
{
name=n;
address=a;
telno=t;
rent=r;
}
void show()
{
System.out.println("Name:"+name);
System.out.println("Address:"+address);
System.out.println("Telephone Number:"+telno);
System.out.println("MonthlyRent:"+rent);
}
}

public class  Bill extends  Detail
{
int n;
double amt;
Bill(String a,String b,long c,double d,int e)
{
super(a,b,c,d);
n=e;
amt=0.0;
}
void cal()
{
if(n>=1 && n<=100)
{
amt=rent;
}
else if(n>=101 && n<=200)
{
amt=n*0.6+rent;
}
else if(n>=201 && n<=300)
{
amt=n*0.8+rent;
}
else if(n>300)
{
amt=n+rent;
}
}
void show()
{
super.show();
System.out.println("Number of calls="+n);
System.out.println("Amount to pay="+amt);
}
}

```
```

Sale

50
Sale

150
Sale

200
Sale

50
Sale

50
Sale

50
Sale

50
Sale

50
Sale

50