Final answer:
To calculate Sophia's minimum sales to earn $1,800, divide her required income by her commission rate of 10.75%, which equals approximately $16,744 when rounded to the nearest dollar.
Step-by-step explanation:
To calculate the minimum amount Sophia needs to sell to earn at least $1,800 in commissions, you would use the formula: minimum sales = required income / commission rate.
In Sophia's case, the formula becomes: minimum sales = $1,800 / 10.75%. To express 10.75% as a decimal, we divide by 100, which gives us 0.1075.
Now we calculate the minimum sales = $1,800 / 0.1075, which equals approximately $16,744.19.
Since Sophia needs to know the minimum sales rounded to the nearest dollar, the answer is $16,744.