A product is originally priced at 80 yuan, but it is sold at a reduced price this month for promotion. After the price reduction, the sales volume has increased by 50% compared to before, so the total sales have also increased by 20%. How much is the price of this product reduced?
一种商品原定价80元，为促销本月降价出售，降价后的销售量比以前增加了50%，这样总销售额也增加了20%，这种商品降价了多少元．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">80 * (1/2)</gadget>
<output>40</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">80 * (1/5)</gadget>
<output>16</output>

<gadget id="calculator">40 - 80 - 16</gadget>
<output>-56</output>

<gadget id="calculator">80 + (-56)</gadget>
<output>24</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">24 / (3/2)</gadget>
<output>16</output>

<result>16</result>