Why does my iPad take so long to charge?

I just bought a iPad 4 on Friday from the Apple store. I was using it the whole day and the I put it on charge overnight for about 10 hours and when I checked in the morning the charging was only 75%. Right now it is on charge and it is was 30%, it has been on charge for 2 hours and is now only 40%.
Why does it take so long to charge?
I always close the apps before charging if that counts for anything.

Read more: Why does my iPad take so long to charge?

School IPad Restrictions?

The year ten students in m year are all getting iPads for classroom use this Friday. It's about time because year 7 and 8 have had theirs for two years. The thing is, the iPads we are getting are going to be an extra fee like the 7 & 8 iPads but ours will have restrictions. We won't be able to download apps and the only thing we will be able to do is use the shitty school apps and safari. Is there a way to bypass these restrictions and download apps onto it? Can you use Dropbox to install apps across devices?
Thanks

Read more: School IPad Restrictions?