Nita blends two varieties of tea one costing Rs. 180 per kg and another costing Rs. 200 per kg in the ratio 5 : 3. If she sells the blended variety at Rs. 210 per kg then her gain is = ?

A. 110%

B. 11%

C. 12%

D. 13%

Answer: Option C

Solution(By Examveda Team)

Let 5 kg of cheaper be mixed with 3 kg of dearer.
Then,
Total CP = Rs. (180 x 5 + 200 x 3) = Rs. 1500
Total SP = Rs. (210 x 8) = Rs. 1680
$$\eqalign{ & {\text{Gain}}\% = \left( {\frac{{180}}{{1500}} \times 100} \right)\% \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 12\% \cr} $$