About _?_ percent of the solar energy that reaches the outer atmosphere is absorbed at the earth’s surface a - 20
b - 30
c - 50
d - 70

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.

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"

the answer is definitely 36.

hope this : )