Answer:
Joe should choose $2100 + 4% of Sales
Explanation:
The options available to Joe are ($1800 + 6.5% of sales) and ($2100 + 4% of sales) for his salary. He chooses the option in which he would get higher salary. Sales are expected to lie between $5000 and $10000.
Let the sales be denoted by
(in Dollars). Joe chooses first option if it is a higher number than the second.
⇒ if


So, he chooses first option if
. However sales is between $5000 and $10000. So, Joe will go with second option.
∴ Joe should choose $2100 + 4% of sales.