<prompt> Translate the following text to EnglishSehemu ya 4 inaonyesha kwamba watu wanaohitaji masaa 700 kwa kila MWh ya kazi kwa mfumo wa SCR kwenye boiler ya makaa ya mawe, na sehemu ya 4 inaonyesha kwamba watu wanahitaji masaa 10 kwa kila MWh ya kazi kwa mfumo wa ACI.  <response>: Chapter 3 showed that about 700 man-hours of labor per MWe are required for an SCR system on a coal-fired boiler, and Chapter 4 showed that roughly 10 man-hours of labor are needed per MWe for an ACI system. 