Demand always changes in the opposite direction to the price  If the price change causes the total income to change in reverse with the price, then the demand is elastic  In 2007, although the tuition fees of W University were reduced by 20%, the total tuition fees received by W University were higher than in 2006
In this case, the demand for W University is flexible
Compared with 2006, the enrollment of W University increased by more than 20% in 2007