Summation based benchmark for calculators

[pier4r]

Thanks for the answer!

Thanks to grsbanks that reported the first entry for the dm42. I asked him to check the results with the prime and 50g, because his devices are like 10x faster than the one reported by other users and by me.

The dm42 is pretty fast! I mean for a product done by a small company (compared to hp, ti, casio, sharp) plus one external indivisual (T.Okken) is quite amazing!