# Tax Reduction effect on agreggate demand

Im trying to figure out what initial and additional effects would a 20 thousand dollar tax reduction with a 3/4 marginal propensity to consume would have on the aggregate demand. I first thought of calculating the tax multiplier = $$- MPC / (1 - MPC)= -3$$

Does this mean that this has a 60 thousand increase on the aggregate demand? $$-3* -20 000 = 60 000$$

What would be the afterwards effect and total effects? Any help is appreciated :)