An index linked gilt was issued on 01.01.11 at par (where par is 100 nominal). At issue, the coupon was 3% per annum per 100 nominal and the redemption amount was 105% of the 100 nominal. The current date is 01.01.20, and the current redemption value stands at 122 per 100. Calculate the average annual inflation that has been used to revalue the redemption amount. Select one: a. 1.7% O b. 22.0% 02.2% 0,20%