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A man buys 3 type-I cakes and 6 type-II cakes for Rs. 900. He sells type-I cakes at a profit of `15%` and type-II cakes at a loss of `10%`. If his overall profit is Rs.30, the cost price (in Rs.) of a type-I and of a type-II cakes is:

A

100, 100

B

160, 70

C

180, 60

D

120, 90

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