9. How much is the compound interest after 4 years? a. P 4,537.90 b. P 13,725.96 c. P 66.671.30 d. P 67,746.38 10. How much is the additional interest earned if instead of 4 years the investment matures after 6 years? a P 6,883.49 b. p 4.537.90 c. 5,822.68 d. P 2.345.59