Question

by selling a table for rupees 7000 a loss of rupees 2000 is suffered.find the price at which the table should be sold to get a gain of 20 percent

Answer 1

Selling price of the table = 7000
Loss = 2000
then cost price = s.p + loss = 7000 + 2000 = 9000
20% of 9000 = 20/100* 9000 = 1800
c.p + gain =9000 +1800 =10800.

Checking 
s.p  = 10800
c.p = 9000
gain = 10800-9000 =1800
gain percentage = gain X 100. = (1800 X 100 )      = 180 = 20%
                             c.p              (9000          )%        9