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Multiply each scale factor by the first set of given perimeter and area
As shown in the picture below
If you have two 10's and three 25's in a list for a stem and leaf plot, it will look like this:
1 | 0 0
2 | 5 5 5
A number occurring more than once in a stem-and-leaf plot just means the number is repeated, and should be added to the plot.
Hope that's what you needed