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Profit and loss calculations are an application of 'expressing one number as a percentage of another'. These calculations tell you how much you have gained or lost as a percentage of your original amount. A very handy type of calculation to understand!
The following is a Mathletics booklet about profit and loss. In it are some explanations, examples and practice problems. The solutions are also included, although you will need to scroll through the solutions booklet to the relevant section (this is a solutions booklet for more than one question booklet).
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The following is from the Oxford Big Ideas 8 text book. Complete these questions.
Now try these: question 3
Explore: questions 5 through to 9
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The Unitary Method is a method to find the original price when the discounted price is given.
These types of problems can be quite challenging to solve, but this method provides a structure to help you work backwards to the original price. Give it a go!
Try questions 10 and 11 from Explore in Ex 2D above, or try the link below.
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The solutions to this booklet is also in the solutions booklet provided above (mathletics).