Wa you really ....... What more you want me to show before you understand.
First sub-total is sources of 'income' or what were credited into the CPF accounts. My maths poor but not like that
The next sub-total is the various deductions against CPF accounts, followed by housing instalments paid net of refunds.
The last sub-total is various credits and debits to the CPF accounts
The grand total is the CPF balances as at (date).
The Investments is the net inflows i.e. inflows less outflows from CPFIA. In other word, this is part of the profit from investments returned to CPF. What's left in CPFIA (in the form of shares held) is the profit not yet transferred back to CPF.
Now clearer?