What was the opearint profit (s$m) associated with an expenditure (s$m) of 12,127.8?
CREATE TABLE "singapore_airlines_group_financial_highl" (
  "year_ended" text,
  "revenue_s_m" text,
  "expenditure_s_m" text,
  "operating_profit_s_m" text,
  "profit_before_taxation_s_m" text,
  "profit_attributable_to_equity_holders_s_m" text,
  "eps_after_tax_diluted_cents" text
);
SELECT "operating_profit_s_m" FROM "singapore_airlines_group_financial_highl" WHERE "expenditure_s_m"='12,127.8';