The refining division looks at each barrel that it obtain from the transportation division as a variable cost of $87.15 per barrel ; if 10 barrels are transferred, it costs the refining division $871.50; if 100 barrels are transferred , it costs $8715. In fact, the variable cost per barrel is $80($79 to purchase the oil from Gulfmex plus $1 to transport it to Houston.) The remaining $7.15($87.15 - $80) per barrel is the transportation division fixed cost and markup. The full cost plus a markup transfer-pricing method causes the refining division to regard the fixed cost(and the 5% markup) of the transportation division as a variable cost and leads to goal incongruence.