The controller (money manager) for a small company puts some money in a bank account paying 5% per year. he uses some additional money, amounting to 1/3
the amount placed in the bank, to buy bonds paying 66% per year. with the balance of the funds, he buys a 8% certificate of deposit. the first year the investments bring a return of $668. if the total of the investments is $10,000 how much is invested at each rate?