Multiply Your Appliance's Age by 100 to Decide if Replacement Outweighs Repair Costs
https://www.mediafire.com/file/8dg1dmlp4e32gqd/pdf-9909-46893.pdf/file
The 50% rule is a straightforward cost-ratio workflow that answers when replacement beats repair. Multiply your appliance's age in years by 100, then compare that number to the repair cost