where— a is the percentage of that year’s GDP that, if the same percentage of the GDP that is projected for each of the next 40 years were contributed (by way of either or both of annual required capital contributions and annual expense payments under section 45) each year for the next 40 years, would be just sufficient, taking into account the Fund balance at the start of that year and projected Fund investment income over the next 40 years, to enable the Fund to meet the expected net cost of the New Zealand superannuation entitlements payable out of the Fund over the next 40 years
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