Lorraine and Colleen are trading stickers for buttons. Each large sticker is worth a large button or three small buttons. A small sticker is worth one small button. A large button is worth three small stickers. Lorraine starts with 30 small stickers and 40 large stickers. She trades 90% of her small stickers for large buttons. She trades 50% of her large stickers for large buttons and trades the rest of them for small buttons. How many buttons does she have by the end?
She trades 27 small stickers because 30 x .9 = <<27=27>>27
She gets 9 large buttons for these because 27 / 3 = <<27/3=9>>9
She trades 20 large stickers for large buttons because 40 x .5 = 20
She gets 20 large buttons for these because 20 / 1 = <<20/1=20>>20
She trades 50% of her large stickers for small buttons because 100 - 50 = <<100-50=50>>50
She trades 20 large stickers for small buttons because 40 x .5 = 20
She gets 60 small buttons because 20 x 3 = <<20*3=60>>60
She has 89 buttons at the end because 9 + 20 + 60 = <<9+20+60=89>>89
#### 89