During a sale, the price of bicycles is reduced by 25 %.
The original price for a cycle was 4,000 kr. How much will it cost after the rebate is deducted?
There are two different methods you can use to figure out the answer:
Method 1
25 % of 4,000 kr = ¼ of 4,000 kr
25 % of 4,000 kr = 0.25 · 4,000 = 1,000 kr.
4,000  1,000 = 3,000 kr
Answer: The cycle will cost 3,000 kr.
Method 2
Because the price becomes 25 % cheaper, the new price is
100 %  25 % = 75 % of the original price. If you convert 75 % to a decimal it becomes 0.75.
The new price can then be calculated like this:
0.75 · 4,000 kr = 3,000 kr
This is another example of a rate of change and more about this will be included in chapter 4.3.
