The unit price ratio of two kinds of ballpoint pens A and B is 4:3. Now I have bought 40 pens of type A and 21 pens of type B, and the total cost is 111.5 yuan. How much is each ballpoint pen of type A?
甲、乙两种圆珠笔的单价比是4：3，现在购买了甲种笔40支和乙种笔21支，共用去111.5元，甲种圆珠笔每支多少元．
<gadget id="calculator">4 * 40</gadget>
<output>160</output>

<gadget id="calculator">3 * 21</gadget>
<output>63</output>

<gadget id="calculator">160 + 63</gadget>
<output>223</output>

<gadget id="calculator">111.5 / 223</gadget>
<output>0.5</output>

<gadget id="calculator">4 * 0.5</gadget>
<output>2</output>

<result>2</result>