I buy coffee from 3 different shops at Rs.150,Rs.140,Rs.130 per kg and mix them in proportion 8:5:3.At what price per kg must I sell the mixture to make a profit of 25%?  Pick:
A) 168.906
B) 178.906
C) 188.906
D) 198.906
E) 158.906
total=16x kg, tot cp=2290x   sp should be=2862.5x   so sp/kg=178.906   ANSWER:178.906
<result>B</result>
I buy coffee from 3 different shops at Rs.150,Rs.140,Rs.130 per kg and mix them in proportion 8:5:3.At what price per kg must I sell the mixture to make a profit of 25%?