#Household math - How many times use a purchase to make it worthwhile...?

Question:

If I buy a table for 590 THB and I want to use it for art. Paying for a latte in a shop is approx. 60 baht per beverage and I consume anywhere from one to three lattes when I draw. How many days of drawing at home will it take for me to pay off the table?

Answer

A minimum of 4 art days out, a maximum of 10 art days out.

Analysis:

Let's first talk about Sunk Cost, which is the concept that once money is spent, it's gone. Nothing you do subsequent to buying the table is going to make the money come back. And so any decision you make concerning having coffee has no bearing on the cost of the table.

Now to the question at hand.

If we look at the number of lattes it takes to exceed the cost of the table, that's:

cost of the table/cost of a coffee = coffees equal to the cost of the table:

(on the 10th coffee, the coffees are worth more).

If we assume 1 coffee per art day, that's a maximum of 10 art days out.
If we assume 2 coffees per art day, that's 5 art days out.
If we assume 3 coffees per art day, that's 4 art days out.

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