Question

a notebook is marked rupees 30 find the prices a student pays for a dozen notebooks if he gets 15% discount.

Answer 1

no.of notebooks brought by the student=12
price of one notebook=30/-
so,actual price of notebooks before discount applied=12*30=360.
discount (15%)=360*15/100=54.
therefore,the student have to pay = 360-54= 306. for it...
hope it works..☺️

Answer 2

12 notebooks = 30 x 12 = 360 rs
discount
$\frac{15}{100} \times 360 = 54 \: rs$
so the student pays= 360-54 = 306 rs