$.$ Write an equation expressing disposable income as a function of national income.

Upper Y Subscript Upper DYDequals$=0\mathrm{.}800\mathrm{.}80$Y

$($Round your response to two decimal$$ places.$)$

Part $4$

d$.$ Write an equation expressing consumption as a function of national

income.

Write the constant values in billions of dollars.

Cequals$=1010$plus$+0\mathrm{.}640\mathrm{.}64$Y

$($Round your response for the intercept to the nearest whole$$ number, and round your response for the slope to two decimal$$ places.$)$

Part $5$

e$.$ Write an equation for the AE function. Write the constant values in billions of dollars.

AEequals$=6060$plus$+0\mathrm{.}640\mathrm{.}64$Y

$($Round your response for the intercept to the nearest whole$$ number, and round your response for the slope to two decimal$$ places.$)$

Part $6$

f$.$ What is the marginal propensity to spend out of national$$ income?

The marginal propensity to spend out of national income is

$0\mathrm{.}640\mathrm{.}64.$

$($Round your response to two decimal$$ places.$)$

Part $7$

g$.$ Calculate the simple multiplier for Sunrise Island.

The simple multiplier for Sunrise Island is

$2\mathrm{.}782\mathrm{.}78.$

$($Round your response to two decimal$$ places.$)$

CThe economy of Sunrise Island has the following features: fixed price level no foreign trade autonomous desired investment $($I$)$ of $$20$ billion autonomous government purchases $($G$)$ of $$30$ billion autonomous desired consumption $($c$)$ of $$10$ billion marginal propensity to consume out of disposable income of $0\mathrm{.}80$ net tax rate of $0\mathrm{.}20$ of national incomeYD$($Round your response for the intercept to the nearest whole number, and round your response for the slope to two decimal places.TY $($Round your response to two decimal places.Upper Y Subscript Upper DY $($Round your response to two decimal places.C$)$Y$($Round your response for the intercept to the nearest whole number, and round your response for the slope to two decimal places.AE$)$Y$($Round your response for the intercept to the nearest whole number, and round your response for the slope to two decimal places.The marginal propensity to spend out of national income is$.($Round your response to two decimal places.The simple multiplier for Sunrise Island is$.($Round your response to two decimal places.