A scale factor needs two numbers, not just one., And they need to have measurement units - such as inches, millimetres, miles or whatever.
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Tautologically!
60% of 125,000= 60% * 125000= 0.6 * 125000= 75,000
Scale factor and perimeter are related because if the scale factor is 2, then the perimeter will be doubled. So whatever the scale factor is, that is how many times the perimeter will be enlarged.
-125000
The areas are related by the square of the scale factor.