The shopping mall bought 400 towels and sold them at 6 yuan each. After selling (4/5), they found that they were very popular, so the shopping mall decided to increase the price of the remaining towels, and the price of each towel was higher than the original (1/3) , how much can you sell the remaining towels for?
商场购进400条毛巾，按每条6元出售，卖出了(4/5)后，发现非常畅销，于是商场决定余下的毛巾提价销售，每条售价比原来贵(1/3)，余下的毛巾能卖多少钱？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">6 * (4/3)</gadget>
<output>8</output>

<gadget id="calculator">400 * (1/5) * 8</gadget>
<output>640</output>

<result>640</result>