Task: Question Answering
Input (English): Problem: the cost of registration at a professional association meeting was $ 50 per person; a lunch for registrants only was available for an additional $ 22 per person. if the number of registrants who paid for lunch was 10 more than the number who did not, and if receipts for registration and lunch totaled $ 61720, how many people paid just for registration at the meeting ?
Options: a. 700, b. 800, c. 1,300, d. 500, e. 1,800
Output (English): d