public void testMath4a() {
    String expression = "(100 % 90) * 20 - 15 / 16 + 80 + (50 * 21)";
    System.out.println("Expression: " + expression);
    assertEquals(((100d % 90d) * 20d - 15d / 16d + 80d + (50d * 21d)), MVEL.eval(expression));
  }