Le Matou matheux: percentages

Examples

What can we say of a percentage increase?

it is always smaller than100%
it is always positive
it is always negative

The duty-free price of a CD is 10 €.
The V.A.T. is 5.5 %.
The price with all taxes included will be ...

more than 10 €
less than 10 €
equal to 10 €

A 100 € item undergoes an increase by 10 %
then a decrease by 10 %. How has the price become?

more expensive
less expensive
the same

A 100 € item undergoes an increase by 10 %
then a second increase by 5 %.
What is the percentage of the final increase?

an increase by 5%
an increase by 10%
an increase by 15%
an increase by 15.5%

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