A baby's heartbeat is about 135 times per minute, which is 60 times more than that of a teenager. How many percent more than a teenager's heartbeat per minute?
婴儿每分钟心跳约135次，比青少年每分钟心跳多60次，婴儿每分钟心跳比青少年多百分之几？
<gadget id="calculator">135 - 60</gadget>
<output>75</output>

<gadget id="calculator">60 / 75</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>