(Friend’s
oven) Feet
Answer:
Your friend used more energy to heat the oven.
Example 2:
You work
for a glass making company. The company could use both residual
fuel and natural gas to heat its main furnace. Your duty is to
choose one of these fuels when the other becomes expensive.
Companyõs furnace now is
using residual fuel. But the cost of residual fuel in this month
has risen. Now you need to decide if it is time to switch to
natural gas or use the same fuel.
Natural
Gas: $4.87*1000 cubic = 4.75
Answer:
You see that the cost of natural gas is still high. Therefore
you have to use residual fuel for this month, and save money.
