> coal: 25 [MJ/kg] * 1000 [kg] = 25000 MJ / 66.85$ = 374 [MJ per $] oil: 47 [MJ/kg] * 159 [kg] = 7473 [MJ] / $26.98 = 276 [MJ per $]

You divided your coal by energy by your oil price and vice versa