exam Maths Puzzle Numerical Ability

convert 3.42 x 10^3 lb/ft^2 to g/cm^2

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Laura invested $2000, some at 8%,annual simple interestand the rest at 10% annual simple interest, giving her a total of $176 per year. How much did she invest at 8%? Can you help me with this problem, i came up with two different answers.
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