book Maths Puzzle Numerical Ability

Let f (x)=x/x-2, and g (x)=1/x-1
Find the composition (f*g)(x)=

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Solve: 7(x - 1) = -14 Karen Waugtal invested some money at 9% annual simple interest and $250 more than that amount at 10% annual simple interest. If her total yearly interest $101, how much was investe