A trader mixes 80 kg of tea at 15 per kg with 20 kg of tea at cost price of 20 per kg. In order to earn a profit of 30%, what should be the sale price of the mixed tea? Select the correct option
A) 23.75
B) 22
C) 20.8
D) 19.2
E) none of these

Rationale: "c . p . of mixture = 80 × 15 + 20 × 20 / 80 + 20 = 16 ∴ s . p . = ( 100 + 30 ) / 100 × 16 = 20.8 answer c"
Answer: C