From the retailer's pricing policy, although a retailer is not likely to share that information with you.
You could find the price before mark-up from the wholesaler and compare that with the retail price. The difference would be the mark-up except that an established retailer is likely to get a better price from the wholesaler than you would.
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add them together and divide them by 4
108/4 = 27
The four basic operations are:+ for addition- for subtraction* for multiplication/ for divisionTo calculate an average, you can use the average() function. Type:=average(then select a range of cells with the mouse. Finish by closing parentheses.
Four A's and Two B's = GPA Average: 3.6 Four A+ and Two B+ = GPA Average: 3.8
86+69+71+56=282 282/the amount of numbers you want to average, so 282/4 = 70.5 70.5 is the average of those four numbers.