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Consider the following statements about cost estimation:

1. The Lang factor scales equipment cost to fixed capital investment.

2. The six-tenths rule scales cost between capacities.

3. Payback period accounts for the time value of money.

Which of the statements given above is or are correct?

  • A.1 and 3 only
  • B.2 and 3 only
  • C.1, 2 and 3
  • D.1 and 2 only

Answer: D

Correct answer: 1 and 2 only

Statements 1 and 2 describe the two scaling tools correctly. Statement 3 is false: payback uses undiscounted cash flows and takes no account of the time value of money - which, with its blindness to everything after the payback point, is its central weakness.

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