if hundred is increased by 40% and then decreased by 40% then the resulting number is
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let first we find the % change
% change = a + b + ab / 100
let a = 40 ( increase ) , b = - 40 ( decrease )
% change = 40 + (-40) +( 40 )( -40) / 100
= 40 - 40 - (1600 / 100)
= 40 - 40 - 16
= 40 - 56
= - 16 % ( decrease )
100% - 16% = 84 %
84 % of 100 = 84 / 100 × 100 = 84
hence , the number will be 84 .
% change = a + b + ab / 100
let a = 40 ( increase ) , b = - 40 ( decrease )
% change = 40 + (-40) +( 40 )( -40) / 100
= 40 - 40 - (1600 / 100)
= 40 - 40 - 16
= 40 - 56
= - 16 % ( decrease )
100% - 16% = 84 %
84 % of 100 = 84 / 100 × 100 = 84
hence , the number will be 84 .
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