June 2014 Ques# 2 Numerical Problem

Can you please guide me on what basis Total Cost in part A of the question is calculated in Examiner’s solution i mean why it is $2250
manual 20*3=60 which is alright, lunch 10*3=30 is ok
but why not Leturer and room cost is multiplied by 3, while it is clear in scenario that lecture cost is 450 per day and Room cost is 250 per day..in my view total cost in 1st row should be
(450X3days)+(250X3days)+(20*3delegates)+(10X3delegates)=$2190, while examiner states total cost as $2250 …Similar prob is with all rows(with other probabilities)