book Maths Puzzle Numerical Ability

The number of barber jobs in 1998 is 54,000. In 2008 it is 50,000. The change is -4. What is th percent of the decrease?

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What is the first step I do to solve [4t-3]=3 A truck travels at 35 km/hr for 30 min. It then travels at 90 km/hr for 45 min. Calculate the total distance that the truck has traveled.