Answer :
The percent error is given by:
[tex]E=\frac{|measured-real|}{real}\times100[/tex]For trial A the percent of error is:
[tex]E=\frac{|240-200|}{200}\times100=20[/tex]20%
For trial B, the percent of error is:
[tex]E=\frac{|195-240|}{240}\times100=18.75[/tex]18.75%