Using linear functions, it is found that the number of electronics that you need to sell for a larger income in option A is x > 200,000.
A linear function is modeled by:
y = mx + b
In which:
Considering the base salaries as the intercept and the commissions as the slope, the functions are given by:
To produce a larger income in option A, it is needed that:
A(x) > B(x).
Hence:
10000 + 0.09x > 20000 + 0.04x
0.05x > 10000
x > 10000/0.05
x > 200,000
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