import java.math.BigDecimal;
import java.text.NumberFormat;
public class FormatTest {
    public static void main(String [] args) {
        final BigDecimal INTEREST_RATE = new BigDecimal("0.05");

        DecimalAccount account = new DecimalAccount(1299,98);
        System.out.println(account.getBalance());

        BigDecimal interest =  account.getBalance().multiply(INTEREST_RATE);
        System.out.println(interest);
        System.out.println(interest.stripTrailingZeros());
        System.out.println(interest.setScale(2, java.math.BigDecimal.ROUND_HALF_UP));
        System.out.println(interest);
        System.out.println(NumberFormat.getCurrencyInstance().format(interest));
    }
}