An employee receives a weekly salary of \( \$ 340 \) and a 6\% commission on all sales. Which rule best describe the function \( f(d) \) that gives weekly earnings in terms of \( d \) dollars in sales \( \begin{array}{l}f(d)=340+6 d \\ f(d)=340+0.06 d \\ f(d)=340-0.06 d \\ f(d)=340-6 d\end{array} \)

To calculate the weekly earnings of the employee, we need to add their fixed salary of $340 to the earnings from their sales commission. Since the employee earns a 6% commission, that would be represented as \( 0.06d \) where \( d \) is the total sales in dollars. So the function that describes the weekly earnings in terms of sales is \( f(d) = 340 + 0.06d \). This means for every dollar in sales, the employee earns 6 cents in addition to their base salary. When it comes to commissions, it's easy to overlook the small details. A common mistake is to confuse percentages with decimal representations, which could lead to an incorrect function choice. Another frequent pitfall is forgetting to add the base salary; some might mistakenly think the commission is the only component. Always double-check that you are accounting for both earnings streams!