level II---ALT building, 矛盾, depend, whereas

rock19840717

alternative P42 第二段第二行，“by variable exp, we mean that they depend on the level of occupancy, whereas fixed exp do not depend on the level of occupancy"
EXAMPLE 20: fixed portion is ($4 * 0.25 * 200,000) / (0.8 * 200,000)=1.25. 其中0.8来自于 the building is 80% occupied。
这里是否有矛盾？为何fixed部分需要除以实际的占用面积，教材里不是说了do not depend on the level of occupancy么，求教。