Answer:
a)
b)
Explanation:
Given:
power usage by the heater,
duration of operating the heater,
power usage by the light bulb,
duration of operating the light bulb,
power usage by the electric stove,
duration of operating the stove,
miscellaneous power usage each day,
a)
Given rate of electricity,
Now the total power consumption each day:
Total power consumption in one month:
Total monthly cost,
b)
calorific value of coal,
efficiency of the powerplant,
The energy output of the powerplant:
The yearly power consumption at this rate will be:
Now the mass of coal required: