Investment bank Canaccord's Think Childcare (TNK) initiation of coverage states: "Building lease costs Rent expense is the second largest cost and TNK reported rent/sales of 12.1%, within the industry range that we typically see as 12-14% of sales. TNK lease all their properties and do not intend to own property. Leases are generally long term with 10-15 year terms and additional options. Although terms vary across properties and landlords, rental increases are generally tied to the consumer price index (CPI)" Assuming that sales grow faster than the CPI, when Canaccord forecast TNK's building lease costs using the 'percent of sales' method, that proportion should:

Select one:

a. Rise over time.

b. Fall over time.

c. Remain constant over time.

d. Insufficient information to make a conclusion.