Consider the following numerical model:

C= 700 + 0.8Y_D

I= 500-2000i+0.1Y

G= 400

T= 500

If T decreases from 500 to 300, how much income (Y) changes for any given level of the interest rate in the goods-market equilibrium? (Add a + or - to the number you reach depending on whether the change is positive or negative)