Julie buys three notebooks. if each notebook cost 30 cent less,

she would have bought one more. How much did she pay for the three

notebooks?

360 cents or $ 3.6

Step-by-step explanation:

Let x be the original cost (in cents) of each note book,

After reducing the price by 30 cents,

New cost of each book = x - 30,

According to the question,

3x = 4 (x-30) (∵ total cost = number of books * cost of each book),

3x = 4x - 120

3x - 4x = - 120

-x = - 120

x = 120

Hence, the cost of three books = 3 * 120 = 360 cents or $ 3.6