IN AN ECONOMY C= 100+ 0.75Y IS THE CONSUMPTION FUNCTION, WHERE C IS CONSUMPTION EXPENDITURE AND Y IS NATIONAL INCOME. IF INVESTMENT EXPENDITURE IS 1000.
(I) DERIVE THE SAVINGS FUNCTION
(II) CALCULATE EQUILIBRIUM LEVEL OF NATIONAL INCOME
(III) CALCULATE ADDITIONAL INVESTMENT NEEDED TO BE REACH THE NEW EQUILIBRIUM LEVEL OF INCOME 6000

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