exam Maths Puzzle Numerical Ability

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

For how many ordered pairs of positive integers (x,y) is 2x+3y < 6? The profit on a watch is given by P = x^2 - 13x - 80, where x is the number of watches sold per day. How many watches were sold on a day when there was a $50 loss?