Java program which calculates total pay of an employee including convaince allounce,house rent and bonus

import java.util.*;
class salary
{
public static void main (String arg[])
{
Scanner in=new Scanner (System.in);
int a,ca;
System.out.print ("\n\t Enter basic pay of the Employe = ");
a=in.nextInt();
ca=(a/100)*3;
float t,b=25,hr=(a*25)/1000;
t=a+ca+hr;
System.out.println ("\n\t Convaince allounce = "+ca);
System.out.println ("\n\t House rent = "+hr);
System.out.println ("\n\t Total pay = "+t);
if (t<=4500)
{
t+=1000;
System.out.println ("\n\t Total pay + bonus = "+t);
}
else if (t>4500 && t<=8000)
{
t+=2000;
System.out.println ("\n\t Total pay + bonus = "+t);
}
else
System.out.println ("\n\t Not defined");
}
}