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A rectangle measures 20cm by 15cm.If each dimension is increased by 2.5cm, by what percentage is

  1. the perimeter of the rectangle increased
  2. the area of the rectangle is increased

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  1. Original perimeter  = 2(20+15) =70
                 Increase = 4 × 2.5 =10              
                      %Inc = 10/70 × 100 =14.29% 
  2. Original area  =20×15=300
    Area with increase =(2.5 +20) (2.5 + 15) = 393.75
    Increase= 93.75                                                     
         % inc= 93.75 ×100 =31.25%                          
                     300

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