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Linear interpolation between two trial rates gives an approximate answer because the present worth function is

  • A.curved rather than straight
  • B.discontinuous at the root
  • C.always increasing with the rate
  • D.independent of the rate over short ranges

Answer: A

Present worth falls with the rate along a convex curve, so a straight line between two points cuts across it and the interpolated root is slightly off. Narrowing the bracket reduces the error to whatever precision is wanted.

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