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The cost of a piece of jewellery is proportional to the square of its weight. A piece of jewellery weighing 10 grams is INR 3600. The cost of a piece of jewellery of the same kind weighing 4 grams is
Given, $$Cost=(k)(Weight)^2$$
also given, $$3600=(k)(10)^2$$ , upon solving this we get k = 36.
Now, for 4 gm jewellery, $$Cost=(36)(4)^2$$ = 576
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