A typist has already typed 1400 characters, which is 30% less than those who have not typed. How many characters are left untyped?
一名打字员已经打了1400个字，比没打的少30%，还有多少字没有打？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1_400 / (7/10)</gadget>
<output>2_000</output>

<result>2_000</result>