This depends on how it is not working.
A general cure-all is to clear your RAM.
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My TI-83 Plus gives the following result 266=7.378697629E19
The answer is approximately 77,459.666924148. I got the answer with a TI-83 plus graphing calculator.
One can purchase a TI-83 calculator in online stores such as Amazon or eBay. In addition, stores such as Walmart or Costco will sell the calculator model.
Yes, hit "math", "PRB", "2"
You can download it from TI's website.