Question 838225
{{{L}}}= original length of the rectangle
{{{W}}}= original width of the rectangle
 
Then,
{{{L*W}}}= original area of the rectangle
{{{1.3L}}}= original length increased by 30%
{{{0.8W}}}= original width decreased by 30%
{{{(1.3L)*(0.8W)}}}= final area of the modified rectangle
{{{(1.3L)*(0.8W)=1.04*L*W}}}= final area of the modified rectangle
{{{1.04*L*W-L*W=(1.04-1)*L*W=0.04*L*W}}}= area increase
{{{0.04*L*W/(L*W)=0.04=4/100=highlight("4 %")}}}= area increase as a fraction or percent of the original area