exam Maths Puzzle Numerical Ability

Can someone help me?

A principal of $5,000 was invested in a savings account for 4 years. If the interest earned for the period was $400, what was the interest rate?

Thank you,
Ashley

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exam Other Question
I was wondering if someone can show me how to set up the problem, im lost Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x.



5. f(x) = ln x