The total output value of a certain factory this year is 18 million yuan, an increase of 30% compared with last year. How much was the total output value of the factory last year?
某工厂今年总产值为1800万元，比去年增加三成，去年该厂总产值是多少万元？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">1_800 / (13/10)</gadget>
<output>18_000/13 = around 1_384.615385</output>

<result>18_000/13 = around 1_384.615385</result>