The salesman earning is an illustration of a piecewise function
The salesman earnings are: y = 500 + 0.12(x-1000); x > 1000 and y = 500; x <= 1000
From the complete question, the salesman earns a commission of 12% on total sales greater than 1000.
If the total sales is x, then the salesman total earnings (y) would be:
y = 500 + 0.12(x-1000); x > 1000
If otherwise, the total sales is not greater than 1000, then the total earnings would be:
y = 500; x <= 1000
Hence, the salesman earnings are: y = 500 + 0.12(x-1000); x > 1000 and y = 500; x <= 1000
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