If the post office is less than 20 grams ₹ 5, 30 grams is less than ₹ 10, 40 grams is less than the ₹ 20 fee. But how many stamps do you have to pay for Ravi 10 grams weight covers 4 and 27 grams weight covers 5?
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He has to pay the amount =4(5)+5(10)=70
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