section_heading: Računanje indeksa iz podataka o rashodima
paragraph_text: P_L =\frac{\sum (p_{c,t_n}\cdot q_{c,t_0})}{\sum (p_{c,t_0}\cdot q_{c,t_0})} =\frac{\sum (p_{c,t_n}\cdot \frac{E_{c,t_0}}{p_{c,t_0}})}{\sum E_{c,t_0}} =\frac{\sum (\frac{p_{c,t_n}}{p_{c,t_0}} \cdot E_{c,t_0})}{\sum E_{c,t_0}} </math>