A large number of melons are on the market. These days, the price is 80% of the previous day. My mother bought 4 on the first day, sold 6 on the second day, and sold 10 on the third day. The total cost was 76 yuan. , if the 20 melons are bought on the third day, how much money can be saved?
某种密瓜大量上市，这几天价格每天都是前一天的80%，妈妈第一天买了4个，第二天卖了6个，第三天卖了10个，共花了76元，若这20个密瓜都在第三天买，则能少花多少钱？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">6 * (4/5)</gadget>
<output>24/5 = around 4.8</output>

<gadget id="calculator">10 * (4/5) * (4/5)</gadget>
<output>32/5 = around 6.4</output>

<gadget id="calculator">4 + (24/5) + (32/5)</gadget>
<output>76/5 = around 15.2</output>

<gadget id="calculator">76 / (76/5)</gadget>
<output>5</output>

<gadget id="calculator">4 + 6 + 10</gadget>
<output>20</output>

<gadget id="calculator">5 * (4/5) * (4/5) * 20</gadget>
<output>64</output>

<gadget id="calculator">76 - 64</gadget>
<output>12</output>

<result>12</result>