Xiaoyun's father brought 50 catties of prickly ash to the county town to sell, planning to pay for Xiaoyun's tuition. After looking at his peppercorns, a buyer came up with two plans: plan one was not to remove the pepper seeds, at 19 yuan per catty; plan two was to remove 0.15 catties of pepper seeds per catty, and then charge 21 yuan per catty for the rest Yuan acquisition. Xiaoyun's father doesn't know how to calculate, and thinks that the second option is more cost-effective, so he decides to sell the peppercorns according to the second option. After returning home, my father told Xiaoyun what had happened, and he was secretly happy that he sold for more money. Xiaoyun did the math and said, "Dad, you were fooled. Plan 2 sold for less money than plan 1!" Dad listened I can't figure out what to say about Xiaoyun, I always feel that there is no less money. Please do the math for Xiaoyun's father, which plan is more cost-effective?
小芸的爸爸带了50斤花椒到县城去卖，准备为小芸做学费．一个买主看了他的花椒后，说出了两种方案：方案一是不除花椒籽，每斤19元；方案二是每斤花椒要除去花椒籽0.15斤，然后剩下的按每斤21元收购．小芸的爸爸不会计算，认为方案二要划算一些，就决定按方案二把花椒卖掉了．回家后爸爸把经过说给小芸听了后，还暗自高兴多卖了钱，小芸算了算，说："爸爸，你上当了，方案二比方案一少卖了钱！"爸爸听了小芸的话怎么也想不通，总觉得没有少卖钱．请你给小芸的爸爸算一算，到底哪种方案更划算？
<gadget id="calculator">50 * 19</gadget>
<output>950</output>

<gadget id="calculator">50 * 0.15</gadget>
<output>7.5</output>

<gadget id="calculator">50 - 7.5</gadget>
<output>42.5</output>

<gadget id="calculator">42.5 * 21</gadget>
<output>892.5</output>

<gadget id="calculator">950 - 892.5</gadget>
<output>57.5</output>

<result>57.5</result>