If the inflation indices was reset to 100 in the the 3rd quarter, what would be the fourth quarter inflation index for food. I have no idea how to do this . Below is the graph:
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Now, the inflation index is reset to 100% at the 1st quarter. We can see that the 3rd- and 4th-quarter values of Foods are 95% and 94%, respectively.
If the index was reset to 100% at the 3rd quarter, the 4th-quarter index would be $94\% / 95\% \approx 99\%$.