what's the country with highest monthly inflation rate being 3.13 × 10 8 %
CREATE TABLE "table1_13681_2" (
  "country" text,
  "currency_name" text,
  "month_with_highest_inflation_rate" text,
  "highest_monthly_inflation_rate" text,
  "equivalent_daily_inflation_rate" text,
  "time_required_for_prices_to_double" text
);
SELECT "country" FROM "table1_13681_2" WHERE "highest_monthly_inflation_rate"='3.13 × 10 8 %';