EASSY PROGRAMMING OF BLUE J

A PROGRAMMING TO PRINT THE ELECTRICITY BILL 
if a=100 =200;
if a>100&&a<=300=200+1.00 per unit
if a>300&&a<=500=200+1.55 per unit
if a>500=200+2.10 per unit

public class electricity {

void main(int a)
{  double t=0;
    if(a<=100)
    {
        t=200;
    }
    if(a>100&&a<=300)
    {
        t=((a-100)*1.00)+200;
    }
    if(a>300&&a<=500)
    {
        t=(a-300)*1.55+(200*1.00)+200;
    }
    if(a>500)
    {
        t=(a-500)*2.10+(200*1.55)+200+(1*200);
    }
    System.out.print(t);

}}

this is an example related to this type of programing