A man invests some money partly in 9% stock at 96 and partly in 12% stock at 120. To obtain equal dividends from both, he must invest the money in the ratio: A) 3:5 B) 2:1 C) 16:15 D) 4:5

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Need help with my Calculus question - I’m studying for my class.

A man invests some money partly in 9% stock at 96 and partly in 12% stock at 120. To obtain equal dividends from both, he must invest the money in the ratio:

A) 3:5

B) 2:1

C) 16:15 

D) 4:5