exam Maths Puzzle Numerical Ability

You have $50,000 to invest, you invest some at 5% and the rest at 4%. You earn $2100 in annual interest, how much did you invest at each rate?

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exam Other Question
I need to completely factor 100-x^2y^2 and I came up with (50-xy)(50+xy). Is this correct? What values for x must be excluded in the following fraction?
x+2/x^2-9x+14