ICSE-VIII-Mathematics
08: Profit, Loss and Discount Class 8 Maths
- #8Mohan bought a certain number of note-books for Rs.600. He sold of them at 5 percent loss. At what price should he sell the remaining note-books so as to gain 10% on the whole?Ans : C.P. of note books = Rs. 600
Gain desired on the whole = 10%
∴ Total S.P. of all the note-books = (100 + gain%)/100 × C.P.
= (100 + 10)/100 × Rs. 600
= Rs. 110/100 × 600
= Rs. 660
C.P. of ¼ of the note-books = ¼ × Rs. 600
= Rs. 150
Loss on these note-books = 5%
∴ S.P. of these note-books = (100 - Loss%)/100 × C.P.
= (100 - 5)/100 × Rs. 150
= Rs. 95/100 × 150
= Rs. 14250/100
= Rs. 142.50
Now, C.P. of the remaining note-books = Rs. 600 - Rs. 150
= Rs. 450
Required S.P. of the remaining note-books = Rs. 660 - Rs. 142.50
= Rs. 517. 50