A plane's speed increases from 200 knots to 250 knots. What is the percentage increase in speed?

To determine the percentage increase in speed, you start by calculating the difference in speed, which is the final speed minus the initial speed. In this case, the plane’s speed increases from 200 knots to 250 knots. The increase in speed is:

250 knots - 200 knots = 50 knots.

Next, to find the percentage increase, you divide the increase by the original speed and then multiply by 100 to convert it to a percentage:

(50 knots / 200 knots) × 100 = 25%.

This calculation shows that the speed increased by 25% from its original speed of 200 knots to the new speed of 250 knots. Thus, the percentage increase in speed is accurately calculated as 25%.