Question

find the selling price,CP = rs 2500,gain = 5 1/2%

Answer 1

profit- 280 rupees
SP- 2500+280= 2780

Answer 2

SP =this is 100+gain% upon 100 and multiply by CP
      = (100+51/2%)/100*2500
      = (100+51)/100*2 *250
       = then 100 will cut 100 and 250 will be divided by 2
       = 51*125
       =6375