book Maths Puzzle Numerical Ability

How much money should be invested at an anual rate of 12% in order to earn $300 interest in a year?
$______
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book Other Question

Find the LCD of the given rational expressions and convert each expression to an equivalent rational expression with LCD as the denominator.

7a over 24x^5 y^2 , 5b over 16x^2 y^
You have $4.45 in nickels and dimes. There are 14 more nickels than dimes. how many of each do you have.