Reading 14 Example 26

On page 113 CFAI text, Reading 14 ex 26 - not sure how they got the 0.07% from ?

Part of the question is below:

What’s the YTM on the new (14½-year) bond?

What was the YTM on the original (15-year) bond?

got it, thanks!

My pleasure.

Please could you tell how the get the 215,850?

It’s half of $431,700.

What’s the spread change?

What’s the benchmark yield change?

thnaks

My pleasure.