given,

cost price(CP) of the tv set = 2500/-

marked price(MP)of the tv set= 3200/-

rate of discount=10%

Total discount=3200 x10/100= 320/-

i) Selling price=3200 -320

=2880/-

ii) profit=SP-CP

=2880-2500

=380/-

profit percent= (profit x 100)/CP

=(380 x 100)/2500

=38000/2500

=380/25

=15.2% is the profit percent made by the dealer