Xiao Wang typed a manuscript. He typed 2,000 words in the morning and 1,500 words in the afternoon, leaving 12.5% untyped. How many words are there in this manuscript?
小王打一份稿件，上午打了2000个字，下午打了1500个字，还剩12.5%没有打，这份稿件共有多少个字？
<gadget id="calculator">2_000 + 1_500</gadget>
<output>3_500</output>

<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">1 - 0.125</gadget>
<output>0.875</output>

<gadget id="calculator">3_500 / 0.875</gadget>
<output>4_000</output>

<result>4_000</result>