为什么 google 在我得到的美元上拿了 0.3

Why does google took 0.3 on the dollar i get

嗨,我开发了一个新的应用程序,并使用 anjlab 库在其中实现了一个 1 美元的支付按钮 当我尝试对其进行测试并使用信用卡付款时,它显示 google 将从该美元中扣除 0.3 如图所示

https://support.google.com/googleplay/android-developer/answer/112622?hl=en

For apps and in-app products offered through Google Play, the service fee is equivalent to 30% of the price. You receive 70% of the payment. The remaining 30% goes to the distribution partner and operating fees.