When a large number of cherries were on the market, the price every day was 80% of the previous day. My mother bought 1.5 kilograms on the first day, 2.5 kilograms on the second day, and 3 kilograms on the third day. The total cost was 27.10 yuan. How much less would it cost if the cherries were all bought on the third day?
樱桃大量上市的时候，每天的价格都是前一天的80%，妈妈第一天买1.5千克，第二天买了2.5千克，第三天买了3千克，共花了27.10元．如果这些樱桃都在第三天买，能少花多少钱？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2.5 * (4/5)</gadget>
<output>2</output>

<gadget id="calculator">3 * (4/5) * (4/5)</gadget>
<output>48/25 = around 1.92</output>

<gadget id="calculator">1.5 + 2 + (48/25)</gadget>
<output>5.42</output>

<gadget id="calculator">27.1 / 5.42</gadget>
<output>5</output>

<gadget id="calculator">1.5 + 2.5 + 3</gadget>
<output>7</output>

<gadget id="calculator">5 * (4/5) * (4/5) * 7</gadget>
<output>112/5 = around 22.4</output>

<gadget id="calculator">27.1 - (112/5)</gadget>
<output>4.7</output>

<result>4.7</result>