Ключевые слова: account, allowance, bank, banking, bill, blocks, business, buyer, cash, charge, commission, concept, cost, credit, cubes, economy, expense, expensive, extra, fee, fees, finance, financial, hidden, interest, money, paid, pay, paying, payment, penalize, penalized, penalizing, penalty, percent, percentage, price, purchase, purchasing, randomly, reward, service, tariff, tax, taxation, trade, wage, wood, wooden, word,