Wu Tong read a fairy tale book. He read 38 pages on the first day and 42 pages on the second day. He read 2% more of the book on the second day than on the first day. How many pages are left?
吴同看一本童话书，第一天看了38页，第二天看了42页，第二天比第一天多看了全书的2%，还剩多少页没有看？
<gadget id="calculator">42 - 38</gadget>
<output>4</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">4 / (1/50)</gadget>
<output>200</output>

<gadget id="calculator">42 + 38</gadget>
<output>80</output>

<gadget id="calculator">200 - 80</gadget>
<output>120</output>

<result>120</result>