Xiao Ming bought a fountain pen and a ballpoint pen. The price of the fountain pen is 5 yuan. The price of the ballpoint pen is cheaper than the fountain pen (3/5). How much is the ballpoint pen?
小明买了一支钢笔和一支圆珠笔，钢笔的价钱是5元，圆珠笔的价钱比钢笔便宜(3/5)，圆珠笔多少元？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

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

<result>2</result>