Ct < W * N * Cpro(where Ct is the cost of the tool, Cpro is the cost of having the repair done professionally, N is the number of times I expect to use the tool in a given year, and W is the wealth factor - that is, when I feel poor, W = 1; when I have disposable income, W has been known to approach values as high as 3.
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... But I really want to.
posted by Malice at 9:40 PM on January 28