Question 1187187

{{{A=LW}}}

the length increase {{{30}}}% =>{{{L+0.30L=1.30L}}}
the width increase {{{20}}}%=>{{{W+0.20W=1.20W}}}

{{{A1=(1.30L)(1.20W)}}}
{{{A1=1.56 LW  }}}

difference

{{{A1-A=1.56LW -LW=(1.56 -1)LW= 0.56LW }}}

=> increase of {{{56}}}%