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$7.$ The multiplier and the MPC

Consider two closed economies that are identical except for their marginal propensity to consume $($MPC$).$ Each economy is currently in equilibrium with real GDP and aggregate expenditure equal to $$100$ billion, as shown by the black points on the following two graphs. Neither economy has taxes that change with income. The grey lines show the $45-$degree line on each graph.

The first economy's MPC is $0\mathrm{.}5.$ Therefore, its initial aggregate expenditure line has a slope of $0\mathrm{.}5$ and passes through the point $(100,100).$

The second economy's MPC is $0\mathrm{.}75.$ Therefore, its initial aggregate expenditure line has a slope of $0\mathrm{.}75$ and passes through the point $(100,100).$

Now, suppose there is a decrease of $$20$ billion in investment in each economy.

Place a green line $($triangle symbol$)$ on each of the previous graphs to indicate the new aggregate expenditure line for each economy. Then place a black point $($plus symbol$)$ on each graph showing the new level of equilibrium output. $($Hint: You can see the slope and vertical axis intercept of a line on the araph by selectina it$.)$