% Gain/Loss per Share = (End Share Price - Start Share Price)/Start Share Price
Start Share Price = Share Price on 4th May 2011
End Share Price = Share Price on 31st May 2011
As per given method calculate gain or loss in respect of 5 shares you have selected.
Thereafter apply these percentages to your investment value to calculated your gain or loss in respect of each company and the total.
Example:
A Company - Investment X Percentage Gain/Loss = Gain/Loss from Company A
B Company - Investment X Percentage Gain/Loss = Gain/Loss from Company B
C Company - Investment X Percentage Gain/Loss = Gain/Loss from Company C
D Company - Investment X Percentage Gain/Loss = Gain/Loss from Company D
E Company - Investment X Percentage Gain/Loss = Gain/Loss from Company E
Aggregate of all Gains would give you the Total Portfolio Gain for the Period + Any Adjustment Required.
* Adjustment would be in respect of dividends etc. will be resolved as an when issues are raised by the members. All issues will be discussed and amicably resolved by the Moderators and Volunteers.