Question 550052
Let the original length and breadth be l and b respectively . Hence initial area is lb
hence the new length is {{{ l(1+20/100) }}} = {{{ l(120/100)}}} = {{{6l/5}}}
hence new breadth will be {{{ l(1-20/100)}}}={{{l(80/100)}}}={{{4b/5}}}
hence new area is {{{6l/5*4l/5}}}={{{24*lb/25}}}
Hence the area decreases .
Decrease in area = {{{lb-24lb/25}}}={{{lb/25}}}
hence % decrease ={{{lb/25/lb*100}}}={{{4 %}}} %