The sales clerks of Teresa's Treasures are paid a salary of $225 per

week plus a commision of 8% on all sales they make. Find the amount of
gross earnings for Jan Yarrow with $3,480.75 sales for the week.
(Find the amount of Commission and gross earnings for these employee's)

To calculate the amount of commission, we need to multiply the sales by the commission rate.

Commission = Sales * Commission Rate
Commission = $3,480.75 * 0.08
Commission = $278.86

To calculate the gross earnings, we need to add the salary and commission.

Gross Earnings = Salary + Commission
Gross Earnings = $225 + $278.86
Gross Earnings = $503.86

Therefore, Jan Yarrow's commission for the week is $278.86 and her gross earnings are $503.86.