book Maths Puzzle Numerical Ability

The amount of tax is directly proportional to the cost of an item. If the tax on a $12,300 car is $738, find the tax on a $9,450 car.

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book Other Question

What is 8/-3 - -7/5? I think I know what it is but I am not sure. If the sales of a product increased by 8% in one year and by 15% in the next year, what was the overall percentage increase in sales over the two years?