80.00% is the percentage equivalent of the fraction 40/50.
The fraction 40/50 can be reduced to 4/5, which still represents the same part of a whole. Whether you write it as 40/50, 4/5, or 0.8, the meaning stays the same: four out of every five parts.
In everyday life you might see this percentage when comparing scores, discounts, or success rates. Saying something is 80.00% complete or achieved gives a clear, quick picture of how much of the total is finished.
