先算weight in total
例如 area 中men’s clothing 600/3,000=0.2
用total cost *weight
例如electricity属于area,
total electricity cost=£ 50,000
men’s clothing weight in total=0.2
Electricity cost in men’s clothing :£ 50,000 *0.2=£ 10,000
其他同理重复1,2步骤
但是这样的需要过程,答案就是第二个啦