exam Maths Puzzle Numerical Ability

If the diameter of a sphere is doubled, its surface becomes
A. doubled the orginal surface
B.four times the orginal surface
C.eight times the orginal surface
D. three times the orginal surface

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exam Other Question

For the following function, C computes the cost in millions of dollars of implementing a city recycling project when x percent of the citizens participate.
C(x) = 1.4x/(100-x) find the simple interes on $6000 borrowed for 3 years at 8.5 interest.