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(A) Let the sales of Lenovo last year be $L = 100$. Then,the sales of Apple last year were $A = 110$. Total sales last year = $100 + 110 + S_{last} =

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$25$

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(A) Let the sales of Lenovo last year be $L = 100$. Then,the sales of Apple last year were $A = 110$. Total sales last year = $100 + 110 + S_{last} = 210 + S_{last}$,where $S_{last}$ is the sales of Samsung last year. This year,Lenovo's sales = $100 	imes 1.20 = 120$. This year,Apple's sales = $110 	imes 1.20 = 132$. Given that this year,Apple's sales are $5$ times Samsung's sales: $S_{this} = 132 / 5 = 26.4$. Since the total market sales remained constant: $210 + S_{last} = 120 + 132 + 26.4$. $210 + S_{last} = 278.4$. $S_{last} = 278.4 - 210 = 68.4$. Total market sales = $278.4$. Percentage of Samsung's sales last year = $(68.4 / 278.4) 	imes 100 \approx 24.57 \% \approx 25 \%$.

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