Final answer:
The real value of the principal at maturity would be $1,150.
Step-by-step explanation:
To calculate the real value of the principal at maturity, we need to take into account the increase in CPI (Consumer Price Index) over the 5-year period. Since CPI increases 3% each year, the total increase over 5 years would be 3% * 5 = 15%.
To calculate the real value of the principal at maturity, we can apply the formula: Real value = Principal value * (1 + CPI increase)
Therefore, the real value of the principal at maturity would be: $1,000 * (1 + 0.15) = $1,000 * 1.15 = $1,150.