A factory produces a certain baby carriage. Due to fierce market competition, the ex-factory price must be controlled within 120 yuan. If the factory wants to obtain a 20% profit, how much must the cost be controlled within?
工厂生产某种童车，因市场竞争激烈，出厂价必须控制在120元以内，工厂要想获得20%的利润，成本必须控制在多少元以内？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">120 / (6/5)</gadget>
<output>100</output>

<result>100</result>