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If - like here - you are asked for a "difference", that usually means you have to subtract. The difference is 2950-2550 = 400 meters
1000 metres = 1 kilometre so 2950 m = 2950/1000 = 2.95 km. Simple!
7% of 2,550 = 7% * 2550 = 0.07 * 2550 = 178.5
Expressed as a percentage, 531/2950 x 100 = 18 percent.
850, ie 2550/3