exam Maths Puzzle Numerical Ability

Sam was charged $484 interest for 1 month on a $4400 credit card balance. What was the monthly interest rate?

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exam Other Question

14. In 2000, the average American generated 4.5 lb of waste per day. How much of that was paper and cardboard?
How do I solve this?
Any fundamental operation (addition, subtraction, multiplication, division, exponentiation) on

Irrational number, which results in:

A rational number.