Unit price of $0.60 per notebook (60 cents per 1 notebook = .60/1).
Explanation:
A rate is a ratio matching quantities of various items. A unit rate is a value 1 in the denominator. The denominator is not going to have the value as 1 when an item has some rate like a cost per any quantity of things. Using division operation one can determine the unit rate.
Unit price of $0.60 per notebook (60 cents per 1 notebook = .60/1).