Question

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.

Answer 1

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