Final answer:
The resulting decrease in the consumption component of AD would be $8 billion.
Step-by-step explanation:
The resulting decrease in the consumption component of AD can be calculated by multiplying the decrease in investment by the MPC. In this case, the decrease in investment is $10 billion and the MPC is 0.8.
Therefore, the resulting decrease in the consumption component of AD would be $10 billion x 0.8 = $8 billion.