Solution - WebAssign
When hired at a new job selling electronics, you are given two pay options.
? Option A: Base salary of $20,000 a year with a commission of 12% of your sales
? Option B: Base salary of $26,000 a year with a commission of 3% of your sales
How much electronics would you need to sell for option A to produce a larger income?
Solution
To find the amount of sales for option A to produce a larger income, first find a model for both
options.
? Let A( s) be the salary in dollars produced per year from option A by selling s dollars¡¯
worth of electronics
o Since the salary increases by 12 cents for each additional dollar in sales, A( s) is
o
o
?
a linear function with a rate of change, or slope, of .12
The initial value is the base salary per year or $20,000.
The linear model is A(s) ? .12s ? 20,000
Let B( s) be the salary in dollars produced per year from option B by selling s dollars¡¯
worth of electronics
o Since the salary increases by 3 cents for each additional dollar in sales, B( s) is a
o
o
linear function with rate of change, or slope, of .03
The initial value is the base salary per year or $26,000.
The linear model is B(s) ? .03s ? 26,000
To find the sales needed so that the salary from option A is greater than option B, find the set of
s-values that make the output values from A(s) ? .12s ? 20,000 greater than the output values
from B(s) ? .03s ? 26,000 by solving the inequality A(s) ? B( s) for s.
.12s ? 20, 000 ? .03s ? 26, 000
.09s ? 6000
6000
s?
? 66, 666.67
.09
Therefore, more than $66,666.67 worth of electronics would need to be sold for option A to
produce a larger income than option B.
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