The activity of ABC's refueling over 200 MINUS 50 refers to the use of ABC credit cards for refueling consumption at the designated gas stations of ABC's credit card refueling activities. When the actual amount of single refueling consumption reaches 200 yuan, users can immediately enjoy preferential relief from 50 yuan. This is a common bank credit card preferential activity, which aims to encourage users to use the Agricultural Bank of China credit card for refueling consumption.