A kind of steel is now priced at 1,800 yuan per ton, which is 12.5% higher than the original price. How much was the original price per ton?
一种钢材，现在每吨售价1800元，比原价调高了12.5%，原来每吨售价多少元？
<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">1 + 0.125</gadget>
<output>1.125</output>

<gadget id="calculator">1_800 / 1.125</gadget>
<output>1_600</output>

<result>1_600</result>