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 20%, what should be the sale price of the mixed tea?	Choose the correct choice
A) 23.75 B) 22 C) 20 D) 19.2 E) none of these

Rationale: "c . p . of mixture = 80 × 15 + 20 × 20 / 80 + 20 = 16 ∴ s . p . = ( 100 + 20 ) / 100 × 16 = 19.2 answer d"
Answer: D