Answer is B.
Monthly amount utitized:
10,000,000 * .08 /12 *3 (for 3 months) = 200,000
20,000,000 * .08 /12 * 6(for 6 months) = 800,000
5,000,000 * .08/12 * 3 (for 3 months) = 100,000
plus
Amount unused
10,000,000 * .005/12 * 3 = $12,500
15,000,000 * .005/12 * 3 = $18,750
=