If the consumption function is C= 50 + .3Y. Then, the saving function will be :

S= -50 + 0.7Y

The correct answer is option (2) : S= -50 + 0.7Y

The saving function is derived from the consumption function by subtracting consumption (C) from income (Y).

Therefore, the saving function (S) is :

S = Y - C

Given the consumption function C= 50 + 0.3 Y subtracting this into the saving function :

S= Y - (50 + 0.3Y)

S= Y - 50 - 0.3 Y

S= -50 + 0.7Y

So, the correct answer is :

S= -50 + 0.7Y