exam Maths Puzzle Numerical Ability

Joan was charged $18 interest for 1 month on a $1200 credit card balance.What is the monthly interest rate?

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exam Other Question

Given that 2.54 centimeters (cm) = 1 inch, 12 inches (in) = 1 foot (ft), and there are 5280 ft = 1 mile, how many centimeters are there in one mile? simplify:
3/{2(x-1)+(x+1)/4