Define variables for number of sales and for total earnings.
be the number of sales and
be the total earnings.
Relate the two variables. Find earnings for a single sale.
Five sales result in earnings of $2.00, 10 of $4, and so on. So, one sale will result in earnings of $0.40. ($2.00
5 = $.40)
Write an equation for total earnings.
Total earnings is $0.40 times the number of sales.
So, the equation is:
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