Let the sides of equilateral triangle be 100cm.Then perimeter of triangle =100+100+100=300
Then the sides of an equilateral triangle are increased by 20%, 30% and 50% respectively
∴ new sides are 120,130 and 150cm
Then parimeter of new triangle =120+130+150=400
Then the increase in the perimeter of the triangle =400−300=100cm
% of increase in the perimeter of the triangle =100×100300=3313%