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The length and breadth of a rectangular plot are 5 x 105 and 4 x 104 metres respectively. Its area is . 

(1) 9 x 101 m2

(2) 9 x 109 m2 

(3) 2 x 1010 m2

(4) 20 x 1020 m2

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Best answer

(3) 2 x 1010 m2

l = 5 x 105 metres; b = 4 x 104 metres 

∴ Area = l x b = 5 x 105 x 4 x 104 

= 20 x 105+4 = 20 x 109 = 2.0 x 101 x 109 

= 2 x 1010 m2

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