A factory manufactures a batch of machines, plans to produce 64 machines per day, and completes them in 15 days. In fact, it only took 12 days to complete the task. How many more units were produced per day than the original plan?
某工厂制造一批机器，计划每天生产64台，15天完成．实际只用了12天就完成了任务，比原计划每天多生产多少台？
<gadget id="calculator">15 / 12</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">64 * (5/4)</gadget>
<output>80</output>

<gadget id="calculator">80 - 64</gadget>
<output>16</output>

<result>16</result>