There are 75 pencils in 3 boxes, and the total price is 30 yuan. What is the unit price of the pencils?
3盒铅笔共75支，总价：30元，那么铅笔的单价是多少角/支
<gadget id="calculator">30 / 75</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 10</gadget>
<output>4</output>

<result>4</result>