Which of the following is the correct formula for calculating boiler e

1.	Which of the following is the correct formula for calculating boiler efficiency?
A.	= ( frac{(h-h_{f1})}{C} )
B.	= ( frac{m_a (h-h_{f1})}{C} )
C.	= ( frac{m_a (h_{f1}-h}{C} )
D.	= ( frac{m_a (h-h_{f1})}{2257} )
Answer» C. = ( frac{m_a (h_{f1}-h}{C} )

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