How To Print Double With 2 Decimal Numbers

I am trying to cast an integer into a double. it works but I need two decimal number after the dot and for example I can print 7.51 but how can I get it to print 7.50 and not 7.5

public int compareTo(Money o){
int d1 = (this.dollars * 100) + this.cents;
int d2 = (o.dollars * 100) + o.cents;
return d1 - d2;
}

On my main method I have

public static void main(String[] args){
Money money1 = new Money(10, 49);
Money money2 = new Money(2, 99);
System.out.println("result: " + "$" + (double)money1.compareTo(money2)/100);
}

It prints 7.5 but I want it to print 7.50, how do I do this .....