Answer: There are 7,800 jars of apple sauce during the two days.
Explanation:
Since we have given that
Number of jars of apple sauce on Thursday = 3600
Number of jars of apple sauce on Friday = 4,200
So, We need to find the number of jars of apple sauce during the two days.
So, Number of jars in these two days is given by

Hence, There are 7,800 jars of apple sauce during the two days.