Laura earns $200 a week plus 7% of all sales over $2500.
One week in January, Laura's total sales were $11, 900.
We are asked to find Laura's earnings for that week?
Step 1:
Subtract $2500 from $11, 900
$11, 900 - $2500 = $9400
Step 2:
Now find the 7% of $9400

Step 3:
Total earnings are
$200 + $658 = $858
Therefore, Laura's earnings for that week are $858