Contemporary Engineering Economics 6th Edition by Chan Park

Exercise 49

By using only those factors given in interest tables, find the values of the factors that follow, which are not given in your tables. Show the relationship between the factors by using factor notation, and calculate the value of the factor. Then compare the solution you obtained by using the factor formulas with a direct calculation of the factor values.
For example, ( F/P, 8%, 38) = ( F/P, 8%, 30)
( F/P, 8%, 8) = 18.6253.
(a) ( P/F, 8%, 67)
(b) (A/P, 8%, 42)
(c) ( P/A, 8%, 135)