exam Maths Puzzle Numerical Ability

What is 30% of 200?

Help me to figure this out? Do I put this into a fraction?

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exam Other Question

Need to find formula-Find the amount of energy that is needed to lift a 2.5-pound textbook 75 feet up a hill. If f(-x) = -f(x) for all choices of x, then what does that tell you about the function f?
Give an example of a function that has this property f(-x) = -f(x) for all real numbers x.