Question 1186036
before,  {{{4*4=16}}}


after, {{{(4)(1.1)(4)(1.1)=4^2*1.1^2=16*1.1^2=16*1.21}}}


amount increase, {{{16*1.21-16}}}
{{{16(1.21-1)}}}
{{{16*(0.21)}}}

{{{(16*0.21)/16=0.21}}}


21 percent increase in area