Cafe x bought 20,000 cups for $1,400 when they opened for business last month. At the end of the month they had 8,000 cups left. How much did the cups add to cost of goods sold (cogs) for the month?

Calculation of the cost of goods sold (cogs) for the month;

It is given that Cafe x bought 20,000 cups for $1,400 when they opened for business last month. At the end of the month, they had 8,000 cups left. It means the Cups sold are (20,000-8000) = 12,000 cups

And the Cost of 12,000 cups sold shall be $1400*12000/20000 = $840

Hence the cost of goods sold (cogs) for the month is $840.