BillyMac wroteI did the math on my trusty Pickett Model N 1010-ES Trig slide rule.
I could go to three significant digits if you would like?

My weapon of choice is the full-size Post Versalog 1460 which I think cost me about $20 in Sep. 1969 when I entered engineering school. I also have a half-size Post Versalog 1460.
When Mark, Jr., graduated from H.S. in May 2008, as a graduation present to send him off engineering school in the Fall I went on eBay and bought him mint condition full-size Post Versalog 1460 including sheath with belt attachment and handbook for $230 not including shipping and handling, LOL!
MTD, Sr.