Can't figure out the math for this question.

5 Suppose that every additional 3 percentage points in the investment rate boosts GDP growth by 1 percentage point. 2 points Assume also that all investment must be financed with consumer saving Note: Investment rate = Investment/GDP eBook The economy is currently characterized by Print Consumption $6 trillion References Saving (= Investment) $1 trillion GDP $7 trillion If the goal is to raise the growth rate by 2 percentage points a. by how much must investment increase? billion b. by how much must consumption decline? billion