A number consists of 30 0.1 and 4 (1/50), what is this number (written as a decimal)
一个数由30个0.1和4个(1/50)组成，这个数是多少(写成小数)
<gadget id="calculator">30 * 0.1</gadget>
<output>3</output>

<gadget id="calculator">1 / 50</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">4 * (1/50)</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">3 + (2/25)</gadget>
<output>77/25 = around 3.08</output>

<result>77/25 = around 3.08</result>