
find a screen
192 Chapter 4
You need a screen for less than $1,440
The cost of giving refunds to people behind the drinks stall
would be $1,440. If you can find a screen to rent for less than
that, it would let everybody see the show and you’d still have
some profits to split.
If you had to give refunds to all the people in that area, how much
would it cost you? (1 person per 2 square meters and $10 a ticket.)
Ouch—screens
start at like $2,000!
Wait…this video store has a
special offer on some slightly
damaged screens—that could
save us!
8
83.5
25
3.5
Area = 8 x 25
+ 2 x 3.5 x 25
2
= 8 x 25 + 3.5 x 25
= 200 + 87.5 = 287.5 sq m
= 287.5 = 144 people = $1440
2
We’ve got a rectangle and two congruent triangles.
The centroid is at 1/3
of the height from
the base
Area of rectangle
Area of triangles, the
2s cancel, which is nice
Round UP to a whole ticket