Calculating Electrons for 4.00nC Negative Charge

[Magna1]

THe question is.
How many electrons must be transferred to a body to give it a negative charge of 4.00nC.?/
So going with what I think 4*10^-9/1.602189...*10^-19=
=25*10^9.
BUT the answer in my book. is 390*10^-9.
What am I missing. Is this negative thing screwing me up or is the answer in my book wrong?
I Can't find anywhere in my book that helps.

 

[Doc Al]

Your method and answer seem correct. The book's answer is silly.

 

[Chi Meson]

OFten what happens: a book will change their problems slightly when a new edition is made, but sometimes they forget to change the selected answers in the back.

 

[Magna1]

Thanks

Hopefuly that was it. Cause I went into my test today with the way I was doing it, Forget the book maybe I should just ask you guys.
Thanks