Step-by-step explanation:
so, to translate the first 2 paragraphs into math notation :
200 + 14×x < 3000
that transforms then to
14x < 2800
and then
x < 2800/14 = 200
so, x < 200
the number of attending people must be under 200.
therefore up to 199 people can attend.
FYI : the request was that the costs must be under the $3000 budget. therefore, we used "<".
if we were allowed to actually reach (and empty) the full budget, then we would have used "<=" (less than our equal), and 200 people could attend.