exam Maths Puzzle Numerical Ability

Lynn Ogen invested some money at 9% interest and $100 less than that at 7% interest. Her total annual interest was $73. How much did she invest at 7% interest?

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3+ sqrt (x^2-8x)=0

Thank you The principal is $2,200. at 12% compounded semi-annually for 2 years. Determine the amount at the end of 2 years.