Ключевые слова: accounting, adult, background, buttons, calculate, calculation, calculator, card, concept, construction, cropped, electric, electrical, electricity, energy, energy efficiency, female, finance, financial, fluorescent lamps, hands, holding, led lamps, lettering, letters, light bulbs, money savings, objects, on white, paper, partial, people, person, power, save, selective focus, signs, studio shot, symbols, table, technology, woman,