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Pauls record shop sells old CDS for 7$ each and cassettes for 2$ each. Today they sold a total of 1400 CDs and cassettes and

Pauls record shop sells old CDS for 7$ each and cassettes for 2$ each. Today they sold a total of 1400 CDs and cassettes and took in $8100. a. How many CDs were sold? b. What was the total dollar sales of cassettes

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