Как я понимаю, почему я должен вернуть annualinterestrate и как ожидаемый результат ниже

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Я не понимаю, почему баланс не составляет 500 долларов, а ежемесячные проценты-не 1,875 доллара

результат:

Balance: $20500.0
Monthly Intetest: $76.875
Date: Mon Jul 08 09:46:02 PDT 2019

ожидать:

Balance: $500.0
Monthly Interest: 1.875
Date Created: Mon Jul 08 09:51:08 PDT 2019

Что я уже пробовал:

package project1;
public class Work2 {
	public static void main(String [] args) {
		Account account = new Account(1122, 20000.0);
		
		account.setAnnualInterestRate(4.5);
		account.withdraw(2500);
		account.deposit(3000);
		
		System.out.println("Balance: $" + account.getBalance());
		System.out.println("Monthly Intetest: $" + account.getMonthlyInterest());
		System.out.println("Date: " + account.getDateCreated());
	}
}

class Account {
	private int ID = 0;
	private double balance = 0.0;
	private static double annualInterestRate = 0.0;
	private java.util.Date createdDate;
	
	public Account() {
		createdDate = new java.util.Date();
	}
	public Account(int ID, double balance) {
		this();
		this.ID = ID;
		this.balance = balance;
	}
	
	public double getBalance() {
		return balance;
	}
	public double getAnnualInterestRate() {
		return annualInterestRate;
	}
	public String getDateCreated() {
		return createdDate.toString();
	}
	
	public void setBalance(double balance) {
		this.balance = balance;
	}
	public void setAnnualInterestRate(double annualInterestRate) {
		this.annualInterestRate = annualInterestRate;
	}
	public double getMonthlyInterestRate() {
		return (annualInterestRate / 100) / 12;
	}
	public double getMonthlyInterest() {
		return balance * getMonthlyInterestRate();
	}
	public void withdraw(double amount) {
		this.balance -= amount;
	}
	public void deposit(double amount) {
		this.balance += amount;
	}
}

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