should be the increase in the price of the book so that his percentage profit remains the salle
18. The difference in prices when a commodity is sold at a profit of 4% and at a profit of 6% is 33. Find the
selling prices of the commodity in the two cases.
19. A man buys a plot of land at 3,60,000. He sells one third of the plot at a loss of 20%. Again, he sells
two-thirds of the plot left at a profit of 25%. At what price should he sell the remaining plot in order to
get a profit of 10% on the whole ?
20. A shopkeeper bought locks at the rate of 8 locks for 34 and sold them at the rate of 12 locks for 3 57
Calculate:
(i) his gain per cent, and
ii) the number of locks he should sell to earn a profit of 45.
[Hint. Let the number of locks bought be the LCM of 8 and 12]
21. Dinesh sold his motorcycle to Naveen at a loss of 28%. Naveen spent * 1680 on its repairs and sold the
motorcycle to Saran for 35,910 making a profit of 12.5%. Find the cost of the motor cycle for Dinesh.
22. The C.P. of two watches taken together is 840. If by selling one at a profit of 16% and the other at a
loss of 12%, there is no gain or loss in the whole transaction then find the C.P. of each watch.
Answers
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Answer:
Let x be C.P
1
st
case S.P = x+
100
4
(x)
=
100
104
x
2
nd
case S.P = x+
100
6
(x)
=
100
106
x
100
106
x−
100
104
x=3 ..... Given
100
2x
=3⇒x=150
1
st
case S.P =
100
104
×150
=Rs156
2
nd
case S.P =
100
106
×150
=Rs.159
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