Final answer:
The incorrect statement regarding the variables that are fundamental to all compound interest problems is D) A time period may be equal to or less than a year.
Step-by-step explanation:
The incorrect statement regarding the variables that are fundamental to all compound interest problems is D) A time period may be equal to or less than a year.
All the other statements are correct:
- A) The future value is the value at a future date of a given sum or sums invested assuming compound interest.
- B) The present value is the value now (present time) for a future sum or sums discounted assuming compound interest.
- C) The rate of interest is a semi-annual rate that must be adjusted, if necessary, to the length of the compounding period.