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Your calculation of % gain is incorrect 18.25/43.465 = 42.0%
I average all the %gains/losses with the assumption of an equal value purchase of all five selections.
The second calculation doesn't invest an equal amount in all selections. The initial investments are weighted by the share price.
Percentages are tricky numbers to use.
An example of their trickiness I often remember is this. If an investment loses 50% in one year and gains 100% next year. The fund manager can claim an average gain of 25% pa (100-50 /2). What's the real gain on the investment after two years?
I average all the %gains/losses with the assumption of an equal value purchase of all five selections.
The second calculation doesn't invest an equal amount in all selections. The initial investments are weighted by the share price.
Percentages are tricky numbers to use.
An example of their trickiness I often remember is this. If an investment loses 50% in one year and gains 100% next year. The fund manager can claim an average gain of 25% pa (100-50 /2). What's the real gain on the investment after two years?