Suppose you have the following information about a closed economy:(Chapter 4-5)

C=5+0.5(Y-T)

I=15-50r

Y=30

T=10

G=5

a.Whataretheequilibriuminterestrate,levelofsavings,andinvestment the economy is a closed economy? How do things change if the economy becomes a smallopeneconomyandtheworldinterestrateis 5%?Showallofthis graphically.