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the increase in weight during (2013 - 2014) = 81 - 72 = 9 kg
% increase during the 1st year =
(increase in weight during 2013 to 2014/weight in 2013) × 100
⇒ % increase during the 1st year = (9/72) × 100 = 12.5%
the decrease in weight during (2014 - 2015) = 81 - 76.5 = 4.5 kg
% decrease during (2014 - 2015) =
(decrease in weight during (2014 - 2015)/weight in 2014) × 100
⇒ % decrease during the (2014 - 2015) = (4.5/81) × 100 = 5.55%
overall % change in weight is =
(difference of weight in 2015 and weight in 2013/weight in 2013) × 100
= (76.5 - 72/72) × 100 = 6.25%
overall % change in weight is 6.25% increase of weight during 2013 - 2015.
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