26. Doubling Your Money Determine how much time is required for an investment to double in value if interest is earned at the rate of 6.25% compounded monthly. 27. Doubling Your Money Determine how much time is required for an investment to double in value if interest is earned at the rate of 6.25% compounded continuously. 28. Tripling Your Money Determine how much time is required for an investment to triple in value if interest is earned at the rate of 5.75% compounded annually. 29. Tripling Your Money Determine how much time is required for an investment to triple in value if interest is earned at the rate of 5.75% compounded daily. 30. Tripling Your Money Determine how much time is required for an investment to triple in value if interest is earned at the rate of 5.75% compounded continuously. 31. Cholera Bacteria Suppose that a colony of bacteria starts with 1 bacterium and doubles in number every half hour. How many bacteria will the colony contain at the end of 24 h? 32. Eliminating a Disease Suppose that in any given year, the number of cases of a disease is reduced by 20%. If there are 10,000 cases today, how many years will it take (a) to reduce the number of cases to 1000? (b) to eliminate the disease; that is, to reduce the number of cases to less than 1