Give an example of a situation in which a percentage is greater than 100%.

Vitamin and nutrition value intake! Some vitamin pills have several hundred percent of a given vitamin, such as vitamin C and zinc. Other situations could be job performance in retail, you're expected to meet a certain minimum quota and you exceed that (ie, sell more stuff than you're required to), you exceed that 100%. Basically, any time there is more of something than is needed, you exceed 100%.