Tuesday, April 08, 2008

Dominos 555 Deal verses 777 deal (Part 2 of 2)

Size of the 14 inch pizza (large) = pi * (7^2) = 153.93804 square inches
Size of the 12 inch pizza (medium) = pi * (6^2) = 113.097336 square inches.

153.93804 - 113.097336 = 40.840704 square inches less per pizza 555 deal compared to the 777 deal.

40.840704 * 3 = 122.522112 square inches total missing in the 555 deal verses the 777 deal.

If you take the amount missing from the 555 deal and divide by the total square inches in the 777 deal you get the following...
122.522112/461.81412 = 0.265306119
0.265306119 * 100% = 26.53% less pizza in the 555 deal verses the 777 deal.

$7 * 3 = $21
$5 * 3 = $15

It is $6 cheaper to get the 555 deal... so lets find out what percentage cheaper that is...
6/21 = 0.285714286
0.285714286 * 100% = 28.57%

So, the conclusion is the 555 deal cost 28.57% less than the 777 deal, but you only lose 26.53% of the pizza... therefore making the 555 deal a better deal, but not by much.

Just to hit it home... here is the price per square inch for each deal indicating the 555 deal gets you the most pizza for your money. Enjoy!
555 deal - $15 / 339.2920 sq. in. = 0.0442 ~ 4.4 cents per square inch
777 deal - $21 / 461.814 sq. in. = 0.0454 ~ 4.5 cents per square inch
444 deal - $12 / 235.6194 sq. in. = 0.0509 ~ 5.1 cents per square inch

**UPDATE**
I've been told that they actually charge $5.55 per pizza for the 555 and $7.77 for the 777... that would change the math a bit... see the following...

555 deal - $16.65 / 339.2920 sq. in. = 0.0442 ~ 4.907 cents per square inch

777 deal - $23.31 / 461.814 sq. in. = 0.0454 ~ 5.047 cents per square inch
444 deal - $12 / 235.6194 sq. in. = 0.0509 ~ 5.1 cents per square inch

It still leaves the 555 deal as the best option, with the 777 in second place, but the margins are not as big. Thanks!

(See Part 1 of 2 for more information)
Note: Delivery charge, Tip, and/or taxes have not been taken into account

3 comments:

chris said...

Matt, you crack me up! (: Thanks for the investigative reporting. I look forward to many more similar articles in the future. Thanks for looking out for my pocketbook! (:

Anonymous said...

They charge you $7.77 for the 777 deal, so that makes the 555 even more appealing right?

Nate Falls said...

I think the math needs to be refined a little bit to compensate for crust around the edges, since the meaningful part of the pie is the part that's covered by cheese and delicious charred flesh.