exam Maths Puzzle Numerical Ability

Population of 280 animals decreases at an annual rate of 18%. Find the multiplier rate of exponential decay.

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an angle its complement always have a sum of 90 degrees the sum of the measures of the angle and five times its complement is 298 degrees. What is the measure of the angle? One year an investment of $80,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8% interes