In order to donate to the 4.20 Ya'an Earthquake as soon as possible, the fruit shop sells at 15% off the original price per ten boxes on the first day, and at 30% off the original price per ten boxes on the second day. On the second day, it was 60 yuan cheaper per ten boxes than on the first day. How much is the original price of this fruit per ten boxes?
水果店为了尽快为4.20雅安地震捐款，第一天按每十箱原价的八五折出售，第二天按每十箱原价的七折出售．第二天比第一天每十箱便宜了60元，这水果每十箱原价是多少元？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(17/20) - (7/10)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">60 / (3/20)</gadget>
<output>400</output>

<result>400</result>