Question

a fruit seller makes a profit of twenty five percent by selling it on a certain price if he charges one on each mango he would gain fifty percent . at what price did he sell first

Answer 1

cost price of mango : Rs X

at 25% profit,  the selling price =  125% X  = 1.25 X

At  50% profit, the selling price = Rs 1.25 X + Rs 1
         so  150% X  =  Rs 1.25 X + Rs 1
              1.50 X = 1.25 X + 1
               0.25 X = 1
              X = 4

Original cost = Rs 4  each mango
Original selling price = 1.25 X = Rs 5
the last selling price = 1.50 X = Rs 6