SOLUTION
GIVEN DATA
demand function is
Q=120-4P+0.01M
M is 40000$
so demand function is
Q=520-4P
and P=10 so
Q=520 - 40
Q=480
to see the choke price
Q=0
so
0=520 - 4P
then
P=130
there we have a triangle with height=130-10=120
and base= 480
so
consumer surplus =
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