Let C = 120 + 0.8y. Assume no government or foreign sectors. At the equilibrium level of income, y* = 200, the level of saving is

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At equilibrium, total spending equals total income, so C + S = Y, where C is consumption, S is saving, and Y is income. Given C = 120 + 0.8y and y* = 200, we substitute to find C = 120 + 0.8(200) = 120 + 160 = 280. Since Y = 200, then S = Y - C = 200 - 280 = -80.