86. What is the nominal rate of interest compounded continuously for 8 years if the present worth factor is equal to 0.6187835?

87. What is the difference of the amount 3 years from now for a 10% simple interest and 10% compound interest per year? (P5000 accumulated)

88. Find the discount if P2,000 is discounted for 6 months at 8% compounded quarterly. 89. If a sum of money triples in a certain period of time at a given rate interest, compute the value of the single payment present worth factor.

90. If the single payment amount factor for a period of 5 years is 1.33822. What is the nearest value of the interest rate?