A set of children's clothing is 42 yuan cheaper than the original price after a 20% discount. How much is the original price of this set of clothing?
一套儿童服装打八折后比原价便宜42元，这套服装原价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">42 / (1/5)</gadget>
<output>210</output>

<result>210</result>