A ring shape metal plate has an internal radius of 7 cm and an external radius of 10.5cm if the cost of matetrial is rupees 5persq.cm ,find the cost of 25rings
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the area of 1 ring is 385 sq.cm
the cost of 1 ring is 5 x 385 = Rs. 1925
the cost of 25 rings is 25 x cost of 1 ring = 25 x 1925 = Rs. 48125
the cost of 1 ring is 5 x 385 = Rs. 1925
the cost of 25 rings is 25 x cost of 1 ring = 25 x 1925 = Rs. 48125
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