Question

What is the difference between the total number of romantic novels sold by stores A, D and G together and the total number of horror novels sold by the same stores together?

• A. 2000
• B. 1600
• C. 2400
• D. 1800
• E. 2200

Answer 1

The correct option is D 1800

Total number of romantic novels sold by store A, D and G together
$=\frac{18+8+10}{100}\times 36000=36\times 360=12960$
Total number of horror novels sold by store A, D and G together
$(\frac{15\times 63000}{100}-\frac{18\times 36000}{100})+(\frac{16\times 63000}{100}-\frac{8\times 36000}{100})+(\frac{13\times 63000}{100}-\frac{10\times 36000}{100})=(15\times 630-18\times 360)+(16\times 630)-8\times 360)+(13\times 630-10\times 360)=(9450-6480)+(10080-2880)+(8190-3600\left)\right(2970+7200+4590=14760)\therefore Requireddifference=14760-12960=1800$