12. From the given rate of simple interest, determine the equivalent rate of discount: 6% for 12 months 13. From the given rate of simple interest, determine the equivalent rate of discount: 6% for 15...

12. From the given rate of simple interest, determine the equivalent rate of discount: 6% for 12 months

13. From the given rate of simple interest, determine the equivalent rate of discount: 6% for 15 months

14. From the given rate of simple interest, determine the equivalent rate of discount: 8% for 120 days