Y = C + I Y = (.5) Y + 260 + 50 Therefore the equilibrium level of GDP in economy without govt. role and foreign trade is -------> 620. La malai choto mitho ako yehi ho ahile lai. Caveat: You may want to verify the answer. It's been many years since I even had a look at these, thus proof-check the solution or use this on your parole. Also, Iamme, the way you ask question is very confusing. Question ko layout ramro sanga gara. Jai Nepal, IndisGuise:)