Answer:
30 kids with some candy left over
The Jacobian for this transformation is

with determinant
, hence the area element becomes

Then the integral becomes

where
is the unit circle,

so that

Now you could evaluate the integral as-is, but it's really much easier to do if we convert to polar coordinates.

Then

200 x 150 = 30,000 to purchase
200 x 175 = 35,000 when selling
35000 - 30000 is 5,000 capital gain
Answer:
It would be 3/2 as 1/2 is 50%, 2/2 or 1 is 100% and 3/2 is 150%
Step-by-step explanation: