Answer :

TPS
least count = 1 mm = 0.1 cm
distance measured = 50 cm

% error = (least count/distace measured)*100 = (0.1/50)*100 = 0.2%
least count = 1 mm = 0.1 cm
distance measured = 50 cm
% error = (least count/distace measured)*100
            = (0.1/50)*100 = 
0.2%