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4

A producer of tea blends two varieties of tea from two tea gardens one costing Rs 18 per kg and another Rs 20 per kg in the ratio 5 : 3. If he sells the blended variety at Rs 21 per kg, then his gain percent is

A. 10%

B. 11%

C. 12%

D. 13%

Please do not use chat terms. Example: avoid using "grt" instead of "great".