Teacher Zhou went to Huangshan for a trip on May Day, and bought some new tea for his father when he came back. He bought 0.5 kg of "Huangshan Maofeng" for 85 yuan, and 0.75 kg of "Taiping Houkui" for 270 yuan. How much is "Huangshan Maofeng" cheaper per kilogram than "Taiping Houkui"?
五一节周老师去黄山旅游，回来时给父亲买了一些新茶．他用85元买了0.5千克"黄山毛峰"，用270元买了0.75千克的"太平猴魁"．每千克"黄山毛峰"比"太平猴魁"便宜多少钱？
<gadget id="calculator">270 / 0.75</gadget>
<output>360</output>

<gadget id="calculator">85 / 0.5</gadget>
<output>170</output>

<gadget id="calculator">360 - 170</gadget>
<output>190</output>

<result>190</result>