Question

by selling 144 notebook Kailash lost lost the SP of 6 notebook find his loss percent. Had he purchased them for Rs.7200, what would have been S.P of one notebook?
Ans: 4% SP= 48

Answer 1

HEY DEAR ... ✌️

______________________

______________________

Let SP of 1 notebook = Rs.k ==> SP of 144 notebook = Rs.144k 
Loss = SP of 6 notebooks = 6k. ==> CP = SP + Loss = 144k + 6K = 150k.
Hence loss % = (Loss/CP) x 100 = (6k/150k) X 100 = 4 %.
---------------------------
Now if CP of 144 notebook = Rs. 7200, 
then SP of 144 notebook at 4% loss = [(100-Loss%)/(100)]xCP
= [(100-4)/(100)]x7200 = Rs.6912. 
Therefore SP of one notebook = SP of 144 notebook /No. of notebook = 6912/144 = Rs.48

________________

HOPE , IT HELPS ... ✌️

Answer 2

Answer:

Loss %= {Loss notebook /total notebook} × 100

= (6/144)×100

= 4.16 % = 4% (approx)

C.P. of 144 notebook = ₹7200

C.P. of 1 notebook = ₹7200/144 = ₹ 50

S.P. of 1 notebook

= {(100 - loss%)/100} × C.P. of 1 notebook

= {(100 - 4)/100} × ₹50

= (96/100) × ₹50

= ₹48.