Wang Min went to the store and bought 10.2 kg of candies with a unit price of 9.8 yuan/kg. As soon as the salesperson picked up the calculator, Xiao Ming said that the payment was 99.96 yuan, and the result was consistent with the result calculated by the salesperson. The salesperson was surprised and said: "You seem to be a child prodigy, how can you calculate so fast?" Wang Min said: "Thank you, I just used a formula I just learned in mathematics." Calculated?
王敏同学去商店买了单价是9.8元/千克的糖果10.2千克，售货员刚拿起计算器，小明就说出应付99.96元，结果与售货员计算出的结果相吻合．售货员很惊讶地说："你好象是个神童，怎么算得这么快？"，王敏说："过奖，我只不过利用了在数学上刚学过的一个公式．"你知道王敏同学是怎样计算的吗？
<gadget id="calculator">9.8 * 10.2</gadget>
<output>99.96</output>

<result>99.96</result>