Question

What is the difference between the average number of sports watches sold by stores B, C, G and H together and the average number of luxury watches sold by the same together?

• A. 1100
• B. 12000
• C. 900
• D. 800
• E. 1300

Answer 1

The correct option is A 1100

Average number of sports watches sold by stores B, C, G and H
$=\frac{41\times 320}{4}=\frac{13120}{4}=3280$
Average number of luxury watches sold by stores B, C, G and H
$(11\times 560-16\times 320)+(14\times 560)-7\times 320)+(5\times 560-6\times 320)=\frac{+(9\times 560-12\times 320)}{4}(6160-5120)+(7840-2240)=\frac{+(2800-1920)+(5040-3840)}{4}=\frac{1040+5600+880+1200}{4}=\frac{8740}{4}=2180$
$\therefore$ Required difference
$=3280-2180=1100$