Ключевые слова: abstract, analyzing, background, business, button, buying, calculating, color, commercial, communication, computer, concept, costs, credit, crisis, cursor, debt, discount, earnings, education, finance, finances, hand, icon, idea, internet, key, keyboard, keypad, laptop, loan, marketing, mathematics, money, network, notebook, number, percent, percentage, red, retail, sale, shopping, sign, solution, success, symbol, technology, white,