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.
The statement 'Compared with 2006, the enrollment of W University increased by more than 20% in 2007' must be true if the above statement is true.