The wire drawing factory undertakes a batch of processing business, and draws a cylindrical steel material with a diameter of 1 cm into a steel wire with a diameter of 0.2 cm. How much longer is the thinned steel wire than the original one.
拉丝厂承接一批加工业务，把直径1厘米的圆柱体钢材拉成直径0.2厘米的钢丝，拉细后的钢丝比原来长多少．
<gadget id="calculator">1 / 0.01</gadget>
<output>100</output>

<gadget id="calculator">0.25 * 100</gadget>
<output>25</output>

<gadget id="calculator">25 - 1</gadget>
<output>24</output>

<gadget id="calculator">24 / 1</gadget>
<output>24</output>

<result>24</result>