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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exam Other Question

How much pure water must be mixed with 3 pints of 70% developer to produce a misture that is 13% developer? The second of three numbers is 1 less than the first. The third number is 5 less than the second. If the first number is twice as large as the third, Find the three numbers.