hi five btw i think 13 is B even i put C........
an increase in consumption from 110 to 200 means it increase by 90....
an increase in 90 in C sees an increase in income by 150.....
so.....150/90 we get 5/3 so for every dollar increase in consumption there will be 5/3 increase in income.....
when investment increase by 40 (200 to 240)....there will be a 40x5/3 increase in income + plus original 300....367Bn.
i have no idea, i put 400bn, and the smart kids in my school + here also put 400, but when i try to justify myself it seems its more like B not C.....