Assume there are no investment projects in the economy that yield an expected rate of return of $25$ percent or more. But suppose there are $$10$ billion of investment projects yielding expected returns of at least $2025$ percent; another $$10$ billion yielding at least $1520$ percent; another $$10$ billion yielding at least $1015$ percent; and so forth.

a$.$ Draw this relationship between the expected return and investment expenditure. $($state the coordinates$)$