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let no be x.
let actual ans be 7x
new ans = x/7
error=7x-x/7 = 48x/7
percentage = (48x/7)/7x * 100 = 97.9% = (d)
( d ) 97.9%
% error= (new no-actual no)/actual no *100
% error= [(x/7)-7x]/7x * 100
% error= 48x/49x * 100
% error= 0.9795*100=97.95