[計量] 看瞴
請各位大大幫忙 感謝
july electricity usage for household
water heater:20%
light.small appliances:9%
large appliance:18%
air conditioner:53%
electricity used:800 kilowatt-hour
Q: the electricity used by the water heater was measured separately and
its cost per kilowatt-hour was one-half the cost per kilowatt-hour of the
rest of the electricity used. The cost of the electricity used by the
water heater was most nearly what fraction of the total cost of
all the electricity used?
a:1/11
b:1/9
c:1/8
d:1/5
我實在是看不懂 只好求助於各位大爺了 感激
可不可以順便解釋一下
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