\begin{align} \text{Per a calcular el rendiment hem de} :&\cssId{Step1}{\eta _{b} =\frac{E_{p}}{E_{m}}}\\[3px] &\cssId{Step2}{E_{m} = P_{m} }\\[3px] &\cssId{Step3}{E_{p} =W }\\[3px] &\cssId{Step4}{\eta _{b}=\frac{W}{P_{m}*t} }\\[3px] &\cssId{Step5}{\eta _{b}=\frac{4,651·10^6}{525*8*\frac{3600s}{1h}} }\\[3px] &\cssId{Step6}{\eta _{b}= 0,3076}\\[3px] \end{align}