exam Maths Puzzle Numerical Ability

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

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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? Can you teach me how to solve this problem.
The sum of three numbers is 105. The third is 11 less than ten times the second. Twice the first is 7 more than three times the second. Find the numbers.