Rational Joao Pedro spends all his money on two goods, X and Y, and always knows for sure his optimal bundle. When the prices of both goods are 3, he chooses the bundle (4, 4). Choose the correct statement (other things being equal):
Countries A, B and C produce only watermelons (X) and grapefruits (Y). The production possibility frontiers are given by: XA+YA=100, 2XB+3YB=300, XC+2YC=600. What is the maximum amount of watermelons that they can produce together if
