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 40 more than the number who did not , and if receipts for registration and lunch totaled $ 39,480 , how many people paid just for registration at the meeting ?
"hope this might be useful to you . let the number of people who have opted only to register = x now since the registration cost is 50 $ per person , the total amount sums to = 50 x $ as per the information given in the question , the number of registrants who paid for lunch was 40 more than the number who did not . that means , total number of people who registered and paid for lunch = 40 + x . for the people who registered for lunch the cost is 50 $ ( for the event registration ) + 22 $ ( for lunch ) = 72 $ . total amount in this case sums to = 72 ( 40 + x ) = 2880 + 72 x now , total amount received was 39480 thus , from the above data , 50 x + 2880 + 72 x = 39480 122 x = 39480 - 2880 122 x = 36600 x = 300 . hence the correct ans is c"
multiply(const_1, const_1)