The number of heartbeats of a person changes with age. The heartbeat of a teenager is about 75 times per minute, and the number of heartbeats per minute of a baby is 80% higher than that of a teenager. How many times per minute is a baby's heartbeat?
人心脏跳动的次数随年龄而变化，青少年心跳每分钟约75次，婴儿每分钟心跳的次数比青少年多80%，婴儿每分钟心跳多少次？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">75 * (9/5)</gadget>
<output>135</output>

<result>135</result>