Final answer:
Katrina needs to sell at least $6,000 in order to earn $600 in commission.
Step-by-step explanation:
To find the minimum amount Katrina needs to sell in order to earn $600 in commission, we need to determine her commission rate. Let's assume her commission rate is 10%. This means that she earns 10% of the total amount she sells as commission. To find the minimum amount she needs to sell, we can set up an equation:
10% of x = $600
0.1x = $600
x = $600 / 0.1
x = $6,000
So, Katrina needs to sell at least $6,000 in order to earn $600 in commission.