Question

1. A fruit vendor purchased a certain number of oranges at 20 for Rs 15 and sold them at 25 for Rs 20. Find his percentage profit or loss.

Answer 1

CP  20    15      375

SP 25      20    400
 JUST DO CROSS MULTIPLICATION ie  25 * 15 = 375 and 20 * 20 =400
     profit = SP - CP  400 - 375 = 25 
         profit% = profit/cp * 100    25/375* 100 =  100/15 = 6* 2/3