​Betsy, a recent​ retiree, requires ​$5,000 per year in extra income. She has ​$70,000 to invest and can invest in​ B-rated bonds paying 15​% per year or in a certificate of deposit​ (CD) paying 5​% per year. How much money should be invested in each to realize exactly ​$5,000 in interest per​ year?

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