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Stiind ca un bec cu fluorescenta de 11W produce aceeasi iluminare ca un bec cu incandescenta de 40W, calculati ce economie in bani veti face pentru un timp de utilizare de 411 ore. Se da tariful furnizorului de energie electrica 0,25lei/kWh. Se va introduce numai valoarea numerica exprimata in lei.
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