Question

What is a salesperson's commission on a $1000 sale if the commission rate is 20%

Answer 1

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He gets only 20% of his sales (without any base salary).

Therefore he has to sell 5000 USD worth goods (or services).

Because four fifths of his sells go to the company.

Your equation:

x=10000.2

x=$5000

He has to sell $5000 to earn $1000 (from total sales) for himself/herself.