Ключевые слова: account, addition, background, balance, bank, blue, business, button, calculate, calculator, count, currency, data, digital, display, divide, economy, electronic, equipment, finance, financial, gray, icon, isolated, keyboard, keypad, math, mathematical, modern, money, multiply, number, object, office, plastic, school, screen, sign, silver, single, symbol, technology, tool, white, work, yellow,