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 most appropriate option:
A) 23.75
B) 22
C) 20
D) 19.2
E) None of these
C.P. of mixture = 80×15+20×20 /80+20=16   ∴ S.P. = (100+20)/100×16=19.2   Answer 19.2
<result>D</result>
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?