Answer: the maximum RPM of the engine is 100.
Step-by-step explanation: 2,500 RPM / Maximum RPM = 62.5% / 100%
To solve for the maximum RPM, we can cross-multiply:
2,500 RPM * 100% = Maximum RPM * 62.5%
25 * Maximum RPM = 2,500 RPM
Dividing both sides by 25:
Maximum RPM = 2,500 RPM / 25
Maximum RPM = 100