A math puzzle for the inquiring mind: The Cow

This cow-themed math puzzle is an excellent brain teaser that is doing the rounds on the internet. We should solve it together.

Problem solution:

Imagine earning $1,000 after purchasing a cow for $800. You invest $1,100 in the cow and earn $1,300 from its sale a few years later. The real question is: What was your total income?
Your total profit, not the sum of your individual transactions, is the missing piece of this puzzle. This can be determined by subtracting the amount you spent on the cow from the amount you earned from selling it.

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