Question 1047206
It's worded in a confusing way.
I think that the venue, {{{ V }}} here is everything 
besides the ticket sales, so:
{{{ V = 65n + 600 }}} 
and
{{{ C = 100n }}}
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What's confusing is they are calling everything "cost",
but {{{ V }}} is a cost and {{{ C }}} is income received
( from the point of view of those running the event )