exam Maths Puzzle Numerical Ability

Solve the following application.
Business and finance. The electricity costs of a business decreased from $12,000 one year to $10,920 the next. What is the rate of decrease?

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exam Other Question

A boat goes 6 miles per hour in still water. It takes as long to go 40 miles upstream as it does to go 80 miles downstream. Find the speed of the current. If the two sides of an angle are each 60, how do you tell the length of the angle bisector