You have just renovated your bedroom and picked out the perfect lighting. However, you are told that you still have to buy your lightbulbs and you will be expected to pay for the electricity for your lights until you are 18 (assume 4 full years for calculation. The lights in your room require five lightbulbs and you have them on for 8 hours a day, 365 days a year (ignore leap years). Electricity will cost you 9 cents/kWh. Your options: LED lightbulbs have a power rating of 8W and cost $20 Florescent lightbulbs have a power rating of 25W and cost $5 Incandescent lightbulbs have a power rating of 80W and cost $0.50 Assuming you have $27 left after your renovation to buy lightbulbs, which combination of 5 bulbs (that you can afford) will cost you the least in electricity for the next 4 years
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
You have just renovated your bedroom and picked out the perfect lighting. However, you are told that you still have to buy your lightbulbs and you will be expected to pay for the electricity for your lights until you are 18 (assume 4 full years for calculation.
The lights in your room require five lightbulbs and you have them on for 8 hours a day, 365 days a year (ignore leap years). Electricity will cost you 9 cents/kWh.
Your options:
- LED lightbulbs have a power rating of 8W and cost $20
- Florescent lightbulbs have a power rating of 25W and cost $5
- Incandescent lightbulbs have a power rating of 80W and cost $0.50
Assuming you have $27 left after your renovation to buy lightbulbs, which combination of 5 bulbs (that you can afford) will cost you the least in electricity for the next 4 years? Show all your work!
Step by step
Solved in 7 steps
