Number of Samsung cellular phones sold by store E is what percent of the number of phones (both Nokia and Samsung) sold by store C?

Solution

Total number of phones (both Nokia and Samsung) sold by store E = $$\frac{12}{100} \times 6400 = 768$$

Nokia phones sold by store E = $$\frac{8}{100} \times 3000 = 240$$

=> Samsung cellular phones sold by store E = $$768 - 240 = 528$$

Number of phones (both Nokia and Samsung) sold by store C = $$\frac{15}{100} \times 6400 = 960$$

=> Required % = $$\frac{528}{960} \times 100 = 55\%$$

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