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 25 % , what should be the sale price of the mixed tea ?
"c . p . of mixture = 80 × 15 + 20 × 20 / 80 + 20 = 16 ∴ s . p . = ( 100 + 25 ) / 100 × 16 = 20 answer c"
add(divide(multiply(divide(add(multiply(80, 15), multiply(20, 20)), add(80, 20)), 25), const_100), divide(add(multiply(80, 15), multiply(20, 20)), add(80, 20)))