NPV – December 2013 Paper Q1

Hi

I was trying the above question and it states that general inflation is 4.7% per year for sales and costs. When I applied 4.7% to my first year figures they were correct but for my second and subsequent figures they were wrong. For my 2nd year figures I applied 9.4% inflation but when I check my answer with the acca solution I am out by a couple of dollars. Am I applying the right inflation by increasing inflation by 4.7% for each subsequent year?? Years 3 & 4 where also out by a couple of dollars

Laura