what is wrong with my java code?

import java.util.*;

public class Main

{

public static void main(String[] args)

{

float savings_yrs;

Scanner i = new Scanner(System.in);

System.out.print("Enter the local fuel price per gallon: ");

float fuel_price_gallon =i.nextFloat();

System.out.print("Enter the Estimated MPG of gas vehicle: ");

float estimated_mpg =i.nextFloat();

System.out.print("Enter the Estimated KWH per mile for EV: ");

float estimated_kwh =i.nextFloat();

System.out.print("Enter the utility KWH rate: ");

float utility_kwh =i.nextFloat();

System.out.print("Enter the total miles are driven per year: ");

float total_miles =i.nextFloat();

savings_yrs=((total_miles/estimated_mpg)*fuel_price_gallon)-((total_miles*estimated_kwh)*utility_kwh);

System.out.println("The potential savings per year on switching from gasoline to electric vehicle is: "+

savings_yrs+"$");

}

}