5 kg of tea costing Rs.75 is mixed with 10kg costing Rs. 180 . The mixture is sold at Rs. 200 per kg . Find the percentage profit.
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Answer:
Suppose a container contains
x
x units of a liquid from which
y
y units are taken out and replaced by water. After
n
n operations, quantity of pure liquid
=
x
(
1
−
y
x
)
n
=x(1−yx)n units.
milk contained by the container now
=
40
(
1
−
4
40
)
3
=
40
(
1
−
1
10
)
3
=
40
×
9
10
×
9
10
×
9
10
=
4
×
9
×
9
×
9
100
=
29.16 is right answer
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