A mixture of solid ammonium chloride and solid sodium chloride can be separated by

sublimation

Explanation:

when a mixture of solid ammonium chloride and solid chloride is heated the ammonium chloride changes it's state from solids to vapour.

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1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

answer; /// i believe that the correct answer is (50%);