If a note book costs Rs p and a pencil costs Rs 3, then the total cost (in Rs) of two note books and one pencil.
Cost of one notebook = Rs p
Cost of 2 notebook = 2 × p = Rs 2p
Cost of one pencil = Rs 3
Total cost = Cost of 2 notebook + Cost of 1 pencil
∴ Total cost = Rs (2p+3)