Question 267929
Mardi received an inheritance of $50,000
Let the amount invested at 7% be = x
She,deposited the remainder in tax-free bonds at 12%
So the amount invested at 12% in tax-free bonds = 50000-x
Total annual income is  x*(7/100)+(50000-x)*(12/100) = 4500
                        7x+600000-12x = 450000
                        -5x = 450000-600000
                        -5x = -150000
                        x = -150000/(-5)
                        x = 30000
So the amount invested at 7%  = $30,000