The energy-efficient light-bulb, taking in 24.0 W of power, can generate the similar level of brightness as a conventional light-bulb operating at power 100 W. The life-time of the energy-efficient bulb is 10 000 h and its purchase price is $4.90, while the conventional bulb consists of lifetime 750 h and costs $0.46 per bulb. Find out the total savings obtained by employing one energy-efficient bulb over its life-time as opposed to by using conventional bulbs over the similar time period. Suppose an energy cost of $0.20 per kilowatt-hour.