A kind of radio, the cost per unit is now reduced (3/20) compared with the original one, and now the cost per unit is 51 yuan, how much was the original cost per unit?
一种收音机，现在每台成本比原来降低了(3/20)，现在每台成本51元，原来每台成本多少元？
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">51 / (17/20)</gadget>
<output>60</output>

<result>60</result>