VK Market's monetization team asks one simple weekly question: how much revenue did the female audience bring. The extract historically carries two gender encodings because different subsystems write differently. Table purchases: - user_id INTEGER — buyer id - user_gender VARCHAR(16) — may be 'female', 'f' (women) or 'male', 'm' (men) - items INTEGER — units - price NUMERIC(12,2) — unit price in rubles - is_promo BOOLEAN — promo flag, ignore here Sum revenue from female buyers as SUM(price * items), and remember that women appear in the data both as 'female' and as 'f'. Round to 2 decimals.