A farmer has developed a new type of fertilizer. this new fertilizercosts 20% more to produce than the old fertilizer but has better results. the same land now produces 25% more crops each year. which statement best describes one way the farm will be affected by using this new fertilizer?

a: the farms marginal cost for fertilizer will increase
b: the farms marginal cost for fertilizer will decrease
c: the farms opportunity cost for using fertilizer will increase
the farms opportunity cost for using fertilizer will decrease