I have 10 questions. Please give me step-by-step answer.

I have 10 questions. I attached correct answer but I don't know how to get these answers. 

Please give me step-by-step answer.

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Question 2:Last month rate: $ = 100¥Today’s spot rate: $ = 110¥ oror ¥ = $0.01¥ = $0.009 ¥ Lost = 0.01 – 0.009 = 0.0009 per $¥ lost = (0.0009 x 100/0.01) = 9%Question 3:Spot rate:...