Arithmatical - Profit and Loss

DIRECTIONS : Problems based on Profit and Loss.
10. A book was sold for Rs.27.50 with a profit of 10%.If it were sold for Rs.25.75, then what wuould have been the percentage of profit or loss?
  A.  2%
  B.  3%
  C.  4%
  D.  5%
Solution
S.P= Rs.27.50
ThenProfit= 10%
So, C.P= Rs.(100/110 x 27.50)
= Rs.25.
when S.P= Rs.25.75
Profit= Rs.(25.75 - 25)
= Rs.0.75.
Profit %= (0.75/25×100)%
=3%.
11. Kunal bought a suitcase with 15% discount on the labelled price. He said the suitcase for Rs.2880 with 20% profit on the labelled price. At what price did he buy the suitcase?
  A.  Rs.2040
  B.  Rs.2400
  C.  Rs.2604
  D.  Rs.2640
Solution
Let the labelled price be Rs.x. Then, 120% of x = 2880
Therefore x=(2880×100/120)
= 2400.
C.P = 85% of Rs.2400= Rs(85/100x2400)
=Rs.2040.

12. I gain 70 paise on Rs.70. My gain percent is
  A.  0.1%
  B.  1%
  C.  7%
  D.  10%
Solution
Gain%=(0.70/70×100)%
= 1%.
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