exam Maths Puzzle Numerical Ability

(y-1)^3 over y^2-2y+1 times y^2-4y+4 over (y-2)^3 =

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Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $780 in interest. How much was invested at 8%? 2/5=5/10n+2