Aunt Li bought a bottle of disinfectant in the supermarket. According to the instruction manual, the disinfectant and water were configured and used according to the mass ratio of 1:200. If Aunt Li wants to prepare 4020g of disinfectant, how many grams of disinfectant is needed?
李阿姨在超市买了一瓶消毒液，按说明书的要求，消毒液与水按照1：200的质量比进行配置使用．如果李阿姨要配制4020g消毒水，需要多少克消毒液？
<gadget id="calculator">1 + 200</gadget>
<output>201</output>

<gadget id="calculator">1 / 201</gadget>
<output>1/201 = around 0.004975</output>

<gadget id="calculator">4_020 * (1/201)</gadget>
<output>20</output>

<result>20</result>