 OK, the natural gas price is given here, which is $1.24 per CCF. And we also know that 1 CCF has 100,000 BTUs or 0.1 million BTUs. So what is the actual price? We are paying $1.24 per CCF divided by the heating value in millions of BTUs per unit fuel. It has to be same unit. So how many million BTUs we get per CCF? 0.1 million BTUs per CCF. So we can cancel the CCF and CCF. Although we buy this 0.1 million BTUs, we get only 82% of that heat actual output because of the efficiency. So we are paying $1.24 and trying to get 0.1 million BTUs. But the furnace gives me only 82% of this 0.1 million BTUs. That's the reason we're multiplying it by efficiency here. This is equal to $10.16 per 1 million BTUs.