Being working in finance and accounting field, having calculator as a gadget is a must. Have you ever wonder what is the history of calculator? Of course the 'ancestors' of calculators are simple abacus (being traced used by the Egyptian) or the famous Chinese suanpan (famously known in Malaysia as sempoa). I used to have one and get the chance to learn how to use the sempoa during my primary school.
Hey bro. This is some kind of online time to do anything. You can find a lot of calculators online. Check out it on Online Calculator.
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