The prices of tea and coffee per kg were the same in june. In july the price of coffee shot up by 20% and that of tea dropped by 20%. if in july , a mixture containing equal quantities of tea and coffee costs 80/kg. how much did a kg of coffee cost in june ?
Choose the correct answer
A) 50
B) 60
C) 80
D) 100
E) 120
Let the price of tea and coffee be x per kg in June.   Price of tea in July = 1.2x   Price of coffee in July = 0.8x .   In July the price of 1/2 kg (800gm) of tea and 1/2 kg (800gm) of coffee (equal quantities) = 80   1.2x(1/2) + 0.8x(1/2) = 80   =&gt; x =80   Thus proved...option 80.
<result>C</result>
The prices of tea and coffee per kg were the same in june. In july the price of coffee shot up by 20% and that of tea dropped by 20%. if in july , a mixture containing equal quantities of tea and coffee costs 80/kg. how much did a kg of coffee cost in june ?