Question

a shopkeeper sold 200 copies of a book at a loss of 5%. if a book costs him rupees 20, find the selling price

Answer 1

total no. of copies = 200
loss on total = 5%

cost prise of a copy = Rs 20
total C.P = Rs 4000

S.P = C.P - loss
= 4000 - 5%of 4000
= 4000 - 200
= 3800

selling price of all the copies = Rs 3800
selling price of 1 copy = Rs 19

Hope it helps!!!

Answer 2

cost of one book is Rs.20 
cost of 200 books is 20 *200=4000
if loss = 5% 
loss=Rs.200
selling price =cost price - loss
                    =Rs.4000-Rs.200
                    =Rs.3800.