book Maths Puzzle Numerical Ability

How do you work out the percentage increase/decrease between two figures?
Example. What is the percent increase/decrease from 41210 to 38853?

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y=2x+5 What is the linear equation of time in hrs. in terms of years 1927 L flight took 33.h from NY to Paris and in 1997 it took 3.3h. Use this equation to predict how long it would hav