The commission on $950 = 13/100 x 950 = $ 123.5
The commission on $2200 = 13/100 x 2200 = $286
The commission on $3000 = 13/100 x 3000 = $390
The commission on $2600 = 13/100 x 2600 = $338
Each commission = 13/100 x the amount in question
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