Subject: mathqa
Question: 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 30 more than the number who did not , and if receipts for registration and lunch totaled $ 75,360 , how many people paid just for registration at the meeting ?
Option: 
A: 1,800
B: 600
C: 800
D: 1,500
Answer: B