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How to add percentages to numbers Word Problems (Alberta Grade 7 curriculum)
Example
Janis goes to a restaurant and spends $32.45 dollars. There is a 5% GST tax and she leaves a 15% percent tip. How much is the total bill?
Steps
1.) Add both percentages together. 15 + 5 = 20. Therefore, treat this as adding 20% to the bill.
2.) Convert the percentage into a decimal. Percent means out of a hundred, which means we can convert to a fraction as well. This turns into 20/100. If still stuck on how to get a decimal, divide the fraction. The answer will be 0.20.
3.) Multiply aforementioned decimal by original number. This will be 6.49.
4.) Add the product and original number together. That is your final answer. ($38.94.)