Giveaway TBT Bells if you can answer economics aplia homework

[unravel]

Right now I'm really having a hard time with economics and I really need help so yeah I'm going to post the screenshots here: http://imgur.com/a/T11G3


I also need an explanation so I'll understand

If you get perfect in
one pic you'll get 20 TBT bells
all = 100 TBT bells