An 11.0-w energy-efficient fluorescent lightbulb is designed to produce the same illumination as a conventional 40.0-w incandescent lightbulb. assuming a cost of $0.111/kwh for energy from the electric company, how much money does the user of the energy-efficient bulb save during 220 h of use?

Explanation:

Energy consumed by 11 W energy efficient fluorescent bulb is given as

now we can say

now total cost of the energy used is given as

Now for conventional 40 W bulb  we can say

now we can say

now total cost of the energy used is given as

So total money saving is given as

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle