urgent plzzz urgent ............ poster cost RS 15.75 each . Posters and packing charges are as under

POSTAGE AND PACKING

1 TO 10 = RS 15

11 TO 20 = RS18

21 TO 30 = RS 22

over 30 =RS 30

Deepika has RS270 to spend the maximum no. of posterswhic she can buy and spend by post :

{a} 13

{b} 15

{c}16

{d}18

In the given question,
Cost of 1 poster = Rs 15.75
Total amount of money which Deepika has = Rs 270

Now,
The maximum number of posters which Deepika can purchase excluding the posting charges = $\frac{270}{15.75}$
      = 17.14
Next, it is given that the posting charges for 11-20 posters is Rs 18.
So,
Amount of money which she has to buy the posters = Total amount of money - Posting charges
  = 270 - 18
  = 252
Thus,
Maximum number of posters which she can buy = $\frac{252}{15.75}$
  = 16

Therefore, Deepika can buy 16 posters from Rs 270.