What was the opearint profit (s$m) associated with an expenditure (s$m) of 12,127.8?
create table table_161591_2 (operating_profit__s$m_ varchar, expenditure__s$m_ varchar, PRIMARY KEY (operating_profit__s$m_))
select operating_profit__s$m_ from table_161591_2 where expenditure__s$m_ = "12,127.8"