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They told me that the formula to calculate my 
return is

         2X(investment return)
------------------------------------------- X 100%          
(opening balance + ending balance 
                       - investment return)

I don't understand why???

Running the numbers through their formula-

investment return = $ 48
opening balance   = $  0
closing balance   = $760

   2x(48)          96
   ------       = ---- = 12.6%   
( 0 + 808 - 48)   760

Why is this correct?

You were adding money to the plan on a regular basis.  
33% of your money was invested for less than a month,
so it makes a smaller contribution to your return.  The
factor of 2 they use basically compensates for this
fact.  I'm assuming the *actual* formula they use is
slightly different to account for different
contributions throughout the year, and to eliminate the
infinity when ending = opening - return (i.e. 0
investment gives you infinite return-- what a deal).
The formula they gave you is designed to be "close
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