The average score of Zhenzhen's previous four math unit tests is 88 points. She wants to work harder, and after the next math unit test, the average score of the five times will reach 90 points. How many points do you need to test.
珍珍前四次数学单元测验的平均成绩是88分，她想再努一把力，在下一次数学单元测验后，使五次的平均成绩达到90分，那么珍珍在下一次数学单元测验中至少需要考多少分．
<gadget id="calculator">90 * 5</gadget>
<output>450</output>

<gadget id="calculator">88 * 4</gadget>
<output>352</output>

<gadget id="calculator">450 - 352</gadget>
<output>98</output>

<result>98</result>