The number of shoes she sells last week (b) 35
From the question, we have the following parameters that can be used in our computation:
Commission = $25 per shoe
Base salary = $450
Amount earned = $1325
The above means that
Amount earned = Commission x Number of shoes + Base salary
Substitute the known values in the above equation, so, we have the following representation
25 x Number of shoes + 450 = 1325
This gives
25 x Number of shoes = 875
So, we have
Number of shoes = 35
Hence, the number of shoes is (b) 35
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