Question

8 meters increased by 25%

Answer 1

25% of 8 m is:
8 m* (25/100)= 2 m

8 m+ 2 m= 10 m

The final answer is 10 m~

Answer 2

8m x 125% = 10 meters

or 

8m * 25% = 2m

Increasd by: meaning addition thus, add 25% of 8 to 8.

8m + 2m = 10 meters.