IF ELSE Statement way

I made a program to calculate total price based on user's input. It is working fine, but i would like to know how to cut the code but to have the same output.

Especially on IF ELSE statement, I would like to know how not to repeat myself in those blocks. Is there any other way I can write ouputs after IF ELSE blocks, or they have to be individually inside of those blocks? Thanks. Here is the code

import java.util.Scanner;
import java.text.*;

public class GasCalc
{
   public static void main(String[] args)`enter code here`
   {
      double gasPrice,carGallons,fullTank,totalPrice;


      Scanner input=new Scanner(System.in);
      System.out.print("Do you want to calculate full tank (y/n) ");
      String askMe=input.next();


      if
      (askMe.equalsIgnoreCase("y"))
      {
         DecimalFormat num=new DecimalFormat("$,###.00");
         System.out.print("What is the price of 1 gallon of gas ? ");
         gasPrice=input.nextDouble();
         System.out.print("How many gallons does your vehicle accept ? ");
         fullTank=input.nextDouble();
         totalPrice=gasPrice*fullTank;
         System.out.println("You will pay "+num.format(totalPrice)+" for the full tank of gas");
      }
      else
         if(askMe.equalsIgnoreCase("n"))
         {
            DecimalFormat num=new DecimalFormat("$,###.00");
            System.out.print("How many gallons do you need ? ");
            carGallons=input.nextDouble();
            System.out.print("What is the price of 1 gallon of gas ? ");
            gasPrice=input.nextDouble();
            totalPrice=gasPrice*carGallons;
            System.out.println("You will pay "+num.format(totalPrice)+" for "+carGallons+" gallons of gas");
         }
   }

}