Summation based benchmark for calculators

[BINUBALL]

I've tested fx-570EX for benchmark.
It's very similar to fx-991EX but there is no solar panel. It uses 1 AAA battery for power so It may be a few faster than fx-991EX.

max = 1000
~ 109s - casio fx-570EX, 1395.346288 sum function
max = 100
~ 12s - casio fx-570EX, 139.297187 sum function
max = 10
~ 2s - casio fx-570EX, 13.71183502 sum function

After test, there are not noticeable difference with fx-991EX. So I tried max = 10000
max = 10000
~ 1073s - casio fx-570EX, 13955.8579 sum function

And I tried to max = 100000, It may take 2 hours..