A toy factory originally needed 4.2 yuan of materials to make a plush rabbit. Later, the production method was improved, and each material only needed 3.8 yuan. I originally planned to make 190 plush rabbits, how many more are I making now?
一个玩具厂做一个毛绒兔原来需要4.2元的材料．后来改进了制作方法，每个只需3.8元的材料．原来准备做190个毛绒兔的材料，现在比原来多做多少个？
<gadget id="calculator">190 / 3.8</gadget>
<output>50</output>

<gadget id="calculator">4.2 * 50</gadget>
<output>210</output>

<gadget id="calculator">210 - 190</gadget>
<output>20</output>

<result>20</result>