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Mathematics, 23.02.2020 05:14 bambamshortymacc

Mr B has $20000 to invest. He invests part at 6% and the rest at 7%. He earns $1280 interest. How much did he invest at each of the rates?

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Mr B has $20000 to invest. He invests part at 6% and the rest at 7%. He earns $1280 interest. How mu...
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