Question

a shopkeeper purchase 400 bulbs for Rs 10 each. 15 bulbs got fused, he sold remaining bulbs at Rs 14 each calculate the loss/gain

Answer 1

Cp= 400*10= 4000
Sp= 385*15 =5775
gain = 5775-4000= 1775

Answer 2

cost price=400*Rs10  
               =Rs.4000
no. of bulbs sold=400-15
                          =385
selling price=385*Rs.14
                   =Rs5390
gain=selling price - cost price
       =5390-4000
       =Rs.1390