Final answer:
To achieve an average of $150 in sales from Monday to Friday, Friday's sale would need to be $220, considering the total for the first four days is $530.
Step-by-step explanation:
To calculate the necessary Friday sales to achieve a weekday average of $150, you first need to determine the total sales from Monday to Thursday and then add the required Friday sales to reach the average.
The total sales from Monday to Thursday are:
$150 (Monday) + $125 (Tuesday) + $75 (Wednesday) + $180 (Thursday) = $530.
To find out what sales on Friday would give a weekday average of $150, you multiply the average by the number of days in the week (5 days), and then subtract the sales from the first four days.
Subtract the total sales from Monday to Thursday from this total:
$750 - $530 = $220.
Therefore, the sales on Friday would need to be $220 to achieve the desired weekday average of $150.