A jacket is sold at a profit of 30%, and after a 15% discount promotion, the profit is still 12.6 yuan. What is the purchase price of this jacket?
一件上衣按30%的利润定价销售，后打八五折促销仍获利12.6元，这件上衣进价为多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) * (17/20)</gadget>
<output>51/200 = around 0.255</output>

<gadget id="calculator">(51/200) - 1</gadget>
<output>-149/200 = around -0.745</output>

<gadget id="calculator">(17/20) + (-149/200)</gadget>
<output>21/200 = around 0.105</output>

<gadget id="calculator">12.6 / (21/200)</gadget>
<output>120</output>

<result>120</result>