The discount offered on each backpack reduces the mean, median and mode.
The mean, median and mode are measures of central tendency. The means is the average of a set of numbers. The median is the number that is in the center of a set of numbers. The mode is the number that occurs most frequently of a set of numbers.
When the discount is applied, the prices of the backpacks become smaller. As a result, the mean, median and mode reduce also.
For example, assume that there are 3 backpacks with the following prices $12, $30 and $30. The mean is 24. The median is $30. The mode is $30. After the discount, the prices become $6, $24 and $24. The mean is 18. The median is $24. The mode is $24.
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