Mingming bought a fish, weighing 1.8 kilograms, at 12.8 yuan per kilogram, and the owner paid 25.4 yuan. Is the owner right? Why?
明明买了一条鱼，重1.8千克，每千克12.8元，店主要明明付25.4元．店主算得对吗？为什么？
<gadget id="calculator">12.8 * 1.8</gadget>
<output>23.04</output>

<result>23.04</result>