How are percents over 100 possible? Plus other math problems.?

I'm doing my math homework and its where I have to find the percent of change. The change is from 125 to 251. My answer is 100.8%. How is this possible if percent means per hundred? I also have these word problems that I don't understand.

1) A store has a frequent shopper program.Depending on the number of items purchased in the previous month, you get an additional 10%, 20%, or 30% off. During a 15% sale, you paid $37.40 for a $55 item. What discount did you receive?

2) A comic book store gives you a discount based on the number of comic books you buy. If you buy 1-5 books, your discount is 5%. 6-10 books, 10%. 10+ books, 20%. Your friend pays $15.29 for comics originally priced at 16.99. What is the least number of books your friend bought?
How are percents over 100 possible? Plus other math problems.?
The percent is frequently more than 100% if it is referring to a change more than the original.



1) $37.40 out of $55 = 37.4梅55 = 0.68 = 68% The percentage off is 100%-68% = 32% which means that the discount% is 32-15 = 17%.



2) discount=16.99-15.29 = $1.70

percent = 1.7 梅 16.99 = 10%



that's it! ;)
How are percents over 100 possible? Plus other math problems.?
Don't think of percents as parts of a whole. Relate them to improper or mixed fractions.

1) It sounds like a trick question. Doesn't it say 15% in the first place?

2) Sorry, too lazy to figure out.

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