When I was at primary school, a "mathomatic" was a polycarbonate template of various shapes, with geometric formulas and other sometimes-useful inscriptions. They were pretty cool according to populations samples of me.
Now, Mathomatic has a new meaning: It's a website (http://mathomatic.orgserve.de/CGI/math.php) performing basic algebra. (it surely does advanced things as well).
Here's a way to use it. Say you want to work out the formula converting gross margin % to mark up %
(the formula is easily found in wikipedia but what's the fun in that?)
Go to the mathomatic website, and run this script online
gmpct = (s-c)/s
mupct = (s-c)/c
eliminate c ;this applies to all equations currently entered, in this case, the two above
simplify
and out pops the answer:
gmpct
#2: mupct = –––––––––––
(1 − gmpct)
or say you want to work out a general formula for finding the VAT amount given a tax-inclusive revenue amount and the VAT percentage (substitute GST for VAT in Australia).
revenue = sales*(1+VAT_PCT)
VAT = sales* VAT_PCT
eliminate sales
VAT
In this case, the final line VAT instructs mathomatic to solve for VAT, ie to leave it on the left side of the equation
revenue·VAT_PCT
#2: VAT = –––––––––––––––
(1 + VAT_PCT)
Yes, easy to do on paper, and I guess easy to remember.
But even easier online!
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