Six pounds [2.5 kg] of wheat costs him 20 cents to grow, but if burned, that quantity of wheat would produce about the same heat as a quart [1 L] of fuel oil, which costs 60 cents.
Dibutuhkan 20 sen untuk menghasilkan dua setengah kilogram gandum, tetapi jika dibakar, gandum sebanyak itu akan menghasilkan panas setara dengan seliter minyak, yang harganya 60 sen.