Mathematics · Mensuration
पीतल के एक ठोस गोले का व्यास 10.5 cm है। ₹4 प्रति 100 cm² की दर से इसकी सतह पर टिन-प्लेटिंग करने की लागत ज्ञात कीजिए। π = 227 का उपयोग करें।
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