A shirt is marked up after the purchase price is increased by 50%, and then sold at a 20% discount due to the season. At this time, a profit of 12 yuan is still made. What is the purchase price of this batch of shirts?
一件衬衫按进价提高50%后标价，后因季节关系按标价8折出售，此时仍获利12元，则这批衬衫的进价是多少元
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (4/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) - 1</gadget>
<output>-3/5 = around -0.6</output>

<gadget id="calculator">(4/5) + (-3/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">12 / (1/5)</gadget>
<output>60</output>

<result>60</result>