Final answer:
The percentage of energy extracted by the turbines in a turboprop engine depends on the engine's efficiency.
Step-by-step explanation:
In a turboprop engine, the turbines extract energy to drive both the compressor and the propeller. The efficiency of the engine plays a major role in determining the percentage of energy extracted by the turbines. From the provided information, it is not possible to determine the exact percentage of energy extracted. However, it can be inferred that the percentage of energy extracted is likely to be less than 100% and greater than 0%.