Joe bought 3 notebooks, 2 boxes of pencils at 1.40 each, and a box of pen at 1.60. She paid a total of 10.40. What was the price of each notebook
Let the price of each notebook be x.
The cost of the 3 notebooks is 3x.
The cost of the pencils is 2 * 1.40 = <<2*1.4=2.80>>2.80
The cost of the pen is 1 * 1.60 = <<1*1.6=1.6>>1.6
The total cost is 3x + 2.8 + 1.6=10.4
Combining like terms, we get 3x + 4.4 = 10.4
Subtracting 4.4 from both sides, we get 3x=6
Dividing both sides by 3, we get x=2
Each notebook costs $<<2=2>>2. Answer: \boxed{2}.