toy airplane now costs 6.8 yuan per plane, which is 3/20 lower than before. How much was the original cost of each toy plane?
一种玩具飞机，现在每架的成本是6.8元，比原来降低了(3/20)，这种玩具飞机原来每架的成本是多少元？
<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">6.8 / (17/20)</gadget>
<output>8</output>

<result>8</result>