Final answer:
Plan A is better than Plan B when monthly sales exceed $30,000. We found this by setting up an inequality to compare both plans' earnings and solving for the sales amount where Plan A surpasses Plan B.
Step-by-step explanation:
To determine for what amount of monthly sales Plan A is better than Plan B, we set up an inequality comparing the total earnings from both plans. Plan A's earnings can be represented by the equation 2500 + 0.06x, where x is the monthly sales, while Plan B's earnings can be represented by the equation 3000 + 0.04x.
We want to find out when Plan A's earnings are greater than Plan B's earnings, so we set up the inequality:
2500 + 0.06x > 3000 + 0.04x
Now we'll solve for x:
Step 1: Subtract 2500 from both sides of the inequality to isolate the variable terms:
0.06x > 500 + 0.04x
Step 2: Subtract 0.04x from both sides to get all x terms on one side:
0.02x > 500
Step 3: Divide both sides by 0.02 to solve for x:
x > 25000
This means that Plan A is better than Plan B when the monthly sales exceed $25,000. Looking at the options provided, the next highest option above $25,000 is $30,000 (Option A). Therefore, Plan A will be better for the employee when monthly sales exceed $30,000.