Answer :

` c, 2 xx 4 xx 25 xx 50 `

` = 8 xx 25 xx 50 `

` = 200 xx 50 `

` = 10000 `

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` d, ( 450 xx 27 ) : 50 `

` = 450 xx ( 20 + 7 ) `

` = 450 xx 20 + 450 xx 7 `

` = 9000 + 3150 `

` = 12150 `