rounding up to the nearest penny in have - rounding

Question

alright heres my assignment question
Create a Java program called DrivingCost that prompts the user to enter the distance to drive, the fuel efficiency of the car in miles per gallon, and the price per gallon, and then displays the cost of the trip:
I am supposed to get the result $81.40 but I keep getting $81.39
How do I round up that penny?
Here's my code
import java.util.Scanner;
public class DrivingCost
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
System.out.print("Enter the driving distance: ");
double distance = input.nextDouble();
System.out.print("Enter miles per gallon: ");
double mpg = input.nextDouble();
System.out.print("Enter price per gallon: ");
double ppg = input.nextDouble();
double cost = distance / mpg * ppg;
System.out.println("The cost of driving is $" + (int)(cost * 100) / 100.0);
}
}

Answer 1

Try...
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;
public class DrivingCost
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
System.out.print("Enter the driving distance: ");
double distance = input.nextDouble();
System.out.print("Enter miles per gallon: ");
double mpg = input.nextDouble();
System.out.print("Enter price per gallon: ");
double ppg = input.nextDouble();
double cost = (distance / mpg) * ppg;
input.close();
NumberFormat df = DecimalFormat.getCurrencyInstance(Locale.US);
System.out.println("The cost of driving is " + df.format(cost));
}
}