Wrong answer in the book Convexity

CFA Level I Fixed Income
#1

At page 274 of the 5th book:

In answer number 3 the delta yield should be positive 0,01 instead of negative and the convexity-adjusted percentage price drop resulting from a 100bp increase in YTM is estimated to be 8,1555%.

the answer says -0,81549 when it should be -0,81555 as stated in the beginning of the answer.

#2

If it’s not in CFA Institute’s errata, you should let them know.

#3

I checked and it`s not, how can I send it to them?

#4

Take a look https://gyazo.com/c85ecbc47295bb2a34a3ad929e0b1c5c

For me it`s clearly wrong…