Wang Li's average score in the previous 4 math tests was 89 points, and she scored 99 points in the fifth test. What is her average score on the 5 tests?
王丽前4次数学测验的平均成绩是89分，第五次得了99分．她5次测验的平均成绩是多少分？
<gadget id="calculator">89 * 4</gadget>
<output>356</output>

<gadget id="calculator">356 + 99</gadget>
<output>455</output>

<gadget id="calculator">455 / 5</gadget>
<output>91</output>

<result>91</result>