Suppose that for the entire economy no investment projects willyield an expected

Suppose that for the entire economy no investment projects willyield an expected real return of more than 12%. However $10billion worth of projects will yield expected real returns of 9.1%to 12% an additional $10 billion will yield expected real returnsof 6.1% to 9% an additional $10 billion will yield expected realreturns of 3.1% to 6% and an additional $10 billion will yieldexpected real returns of 0% to 3%. If the real rate of interest is6% desired investment spending will be:A)$0 billionB)$10 billionC)$20 billionD)$30 billion