Inflation rate calculation?

From 1997 to 1998, the CPI for medical care increased from 260.8 to 272.8. What was the inflation rate for the medical care?

The ans given is 4.6 but I got 4.9 as my ans.. As I am still new to the topic, I am not really sure if i am really correct.. So can anyone help me with this.. Ty..
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