Section: Math

27) An entertainment superstore is running a special sale on DVDs and Blu-ray. DVDs (d) are priced at $8 during the sale while Blu-ray (b) are priced at $15. Each price point is a 20% reduction off the regular price. The sale pulls in $1,250 with 60 total units sold. During a regular day, DVDs and Blu-ray combine for around $800 in total sales while moving two-thirds the number of units on the special sale day. Solving which of the following systems of equations will reveal d and b sold during a regular day?

1. d+b=40
   10d+18.75b=800
2. d+b=40
   8d+15b=1,250
3. d+b=60
   8d+15b=1,250
4. d+b=1,250
   8d+15b=60

Since the problem is asking for the numbers of d and b on a regular sale day, Answer 1 is the only choice that rings true. d+b=40 (number of combined units) and 10d with $10 being the regular price of DVDs while $18.75 is the regular price of Blu-ray adding up to $800.