There are 10 questions in a test paper, and the score of each subsequent question is 2 points more than that of the previous question. If the full score of this test paper is 100, what is the score of the eighth question?
一张考试卷共有10道题，后面的每一道题的分值都比其前面一道题多2分．如果这张考卷的满分为100分，那么第八道题的分值应为多少？
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">20 - 9</gadget>
<output>11</output>

<gadget id="calculator">11 + 2 + 2</gadget>
<output>15</output>

<result>15</result>