P=P01−P02P×100P=\frac{P_{0_{1}}-P_{0_{2}}}{P} \times 100P=PP01−P02×100
P=PO2−PO1PO1×100P=\frac{P_{O_{2}}-P_{O_{1}}}{P_{O_{1}}} \times 100P=PO1PO2−PO1×100
P=P01−PO2PO2×100P=\frac{P_{0_{1}}-P_{O_{2}}}{P_{O_{2}}} \times 100P=PO2P01−PO2×100
P=P02−P01P01×100P=\frac{P_{0_{2}}-P_{0_{1}}}{P_{0_{1}}} \times 100P=P01P02−P01×100
