The price of an MP3 is 100 yuan, which is (1/2) of a small tape recorder, and the price of a small tape recorder is (1/20) of a TV set. How much is the price of a TV set ?
一台MP3的售价是100元，是一台小录音机的(1/2)，一台小录音机的价格又是一台电视机的(1/20)，一台电视机的售价多少元？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">100 / (1/2) / (1/20)</gadget>
<output>4_000</output>

<result>4_000</result>