Ten days before the opening of Mingguang Home Appliances, all home appliances were sold at a 10% discount. During this period, Uncle Li bought a TV and a washing machine, plus a shipping fee of 20 yuan, which cost a total of 4,250 yuan. How much should an item cost?
明光家电开业前十天所有家电均降价一成销售，李叔叔在这期间买了一台电视机和一台洗衣机，加上20元的运费一共花了4250元，如果不降价李叔叔买这两件商品该花多少钱？
<gadget id="calculator">4_250 - 20</gadget>
<output>4_230</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">4_230 / (9/10)</gadget>
<output>4_700</output>

<result>4_700</result>