 |
|
 Home
Products
Store
Forum
Warehouse
Contact Us
|
|
|
|
 
|
|
Author
|
Topic: Film-Guard & Kerosene Lamps
|
|
|
|
|
John Walsh
Film God
Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999
|
posted 09-13-2000 09:13 PM
Sort of reminds me of that review in "Road and Track" years ago, when there was a big concern about gas mileage.The editors looked in the back pages to find all of the ads for products that "...guarantee to increase you mileage by xx%, or your money back!" They bought several of them, and installed them all in one car. Their mileage actually decreased. They wrote; "... if you add up all the percentage increases shown by the makers of these products, we should not only be saving gasoline, we should actually be producing it!" Film-Guard's great for film, but I don't think it will do anything for kerosene kamps!
| IP: Logged
|
|
Evans A Criswell
Phenomenal Film Handler
Posts: 1579
From: Huntsville, AL, USA
Registered: Mar 2000
|
posted 09-14-2000 09:41 AM
The fallacy in the logic that a bunch of decreases in the amount of fuel usage would eventually have you producting fuel is that you don't add up all of the individual percentages to calculate the total reduction. This is quite humorous and I remember this exact thing, with regard to cutting gas usage, was done on "Real People", a 70s TV show. They added up a bunch of improvements that could be made and came up with a savings of 120 percent.To find the correct "total percentage" from a bunch of percentage reductions, divide each percentage by 100, subtract each from 1, multiply all of them together, and subtract the result from 1. Then multiply back by 100. I'll demonstrate. You have four discounts applied to a purchase (or they could be reductions in fuel usage): a 10 percent, 15 percent, a 5 percent, and a 20 percent. What is the net percentage discount (or reduction)? Compute (1 - 0.10) times (1 - 0.15) times (1 - 0.05) times (1 - 0.20), which comes to 0.5814. Subtract that from 1 and you get 0.4186, which multiplied by 100 gives the net discount of 41.86 percent, which is not the 50 percent you'd get if you added the percentages together. Improvements work similarly. If last week's popcorn profits were 10 percent better than the previous week, and this week's popcorn profits are 10 percent better than last week's, that's a 21 percent improvement over 2 weeks, not 20 percent. (1 + 0.10) times (1 + 0.10) is 1.21. 1.21 - 1 = 0.21. 0.21 times 100 = 21, which is the correct number.
| IP: Logged
|
|
|
|
All times are Central (GMT -6:00)
|
|
Powered by Infopop Corporation
UBB.classicTM
6.3.1.2
The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion
and agrees to release the authors from any and all liability.
|
|
|
|
Printer-friendly view of this topic