exam Maths Puzzle Numerical Ability

Can someone help me I am stuck?
Joe was charged $782 interest for 1 month on a $4600 credit card balance. What was the monthly interest rate?

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exam Other Question

Suppose that a polynomial function of degree 4 with rational coefficients has 6, 4, 5i as zeros. Find the other zero. The sum of two numbers is 48. The difference between three times the smaller number and the larger number is 16. Find the numbers.