An average consumer allocates expenditure among food, accommodation and clothing in the ratio 5 : 3 : 2. Over one year, the price of food increases by 10 %, the price of accommodation stays unchanged and the price of clothing decreases by 5 %. By how much does the Consumer Price Index rise over the year?
- A2.5 %
- B4 %
- C5 %
- D6 %