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1. Refer to the pie-chart and answer the given questions.
Distribution of total number of Dell Laptops Sold by 5 Stores.

Distribution of number of Laptops (both Dell and Lenovo) Sold by 5 Stores in 2011.

What is the difference between number of laptops (both Dell and Lenovo) sold by store Q and total number of Lenovo laptops sold by store R and S together?

A. 185

B. 99

C. 91

D. 119

Solution:

Percent of Laptops Dell and Lenovo sold by store Q = 23%
Number of Laptops Dell and Lenovo sold by store Q

\begin{aligned} = 4500 \times \frac{23}{100} \\ = 45 \times 23 \\ = 1035 \end{aligned}

Percent of Laptops Dell and Lenovo sold by R and S together
= 35% + 11%
= 46%
Now, total number of Laptops Lenovo and Dell sold by R and S together

\begin{aligned} = 4500 \times \frac{46}{100} \\ = 2070 \end{aligned}

Percent of Dell Laptops sold by R and S together
= 30% + 9%
= 39%
Number of Dell Laptops sold by R and S together

\begin{aligned} = 2400 \times \frac{39}{100} \\ = 936 \end{aligned}

Number of Lenovo Laptops = 2070 - 936 = 1134
Required difference
= 1134 - 1035
= 99

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