12. A certain company has records stored with a record-storage firm in 15-inch by 12-inch by 10-inch boxes. The boxes occupy 1.08 million cubic inches of space. If the company pays $0.25 per box per month for record storage, what is the total amount that the company pays each month for record storage?

(A) $150

(B) $300

(C) $600

(D) $1,200

(E) $2,400

单位体积15*12*10=1800

总体积=1080000

数量=1080000/1800=600

月费用=0.25*600=150