Question

I need to know the formula for finding the 'lost sales'. I'm given the following information.

a. New Output
b. Lost Output (Construction)
c. New Sales
d. New Gross Margin
e. New Gross Profit
f. Old Output
g. Old Sales
h. Old Gross Profit
i. Incremental Gross Profit

I thought the Lost Sales would equal to New Sales - Old Sales, but my assumption is incorrect.