4. A large, coal-fired electric power plant produces 12 million kilowatt-hours of electricity each day. Assume that an input of 10,000 BTUs of heat is requires to produce an output of 1 kilowatt-hour of electricity. (a) Showing all steps in your calculations, determine the number of

(i) BTUs of heat needed to generate the electricity produced by the power plant each day,

(ii) Pounds of coal consumed by the power plant each day, assuming that one pound of coal yields 5,000 BTUs of heat,

(iii) Pounds of sulfur released by the power plant each day, assuming that the coal contains one percent sulfur by weight