A, B, and C are in a computer typing competition. A types 150 per minute, B types 130 per minute, and C types 40 per minute. What is the percentage of A's typing in the sum of the three typing?
甲、乙、丙三人进行电脑打字比赛，甲每分钟打字150个，乙每分钟打字130个，丙每分钟打字40个，则甲打字占三人打字总和的百分数为多少．
<gadget id="calculator">150 + 130 + 40</gadget>
<output>320</output>

<gadget id="calculator">150 / 320</gadget>
<output>15/32 = around 0.46875</output>

<result>15/32 = around 0.46875</result>