Answer:
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
