Sunday, February 15, 2015

The maths of discounting - courtesy Myantra / Jabong

An pair of shoes cost 2495 at MRP, and are being sold at a discount of 30%. So how much will you finally pay?

2495 - 2495*30% = 2495 - 748.5 = 1746.5

Pretty simple, right? Apparently Myantra and Jabong disagree. In their maths you will actually pay 1934.

Which is actually a discount of 22.5%.

The thing is that they show this 30% discount on the product page, but add up VAT at checkout. So while the product page will show 30% discounted price of 1746, the final checkout will show 1934. Normally all this is fine, as the customer knows finally what is paying.

But the issue is that if the item is not discounted, then the price you see on the product page is what you will pay on checkout. So if the product page shows 2999 at MRP, then that's the final price you pay.

Myantra / Jabong will claim that they bear the VAT if there is no discount, so some such logic. This is immaterial to the customer.

This practice is patently misleading. If you claim 30% discount, then that's the price the customer should pay.

Note that Flipkart, Amazon or Ebay don't do this. They actually list the price you finally pay.

So why can't Myantra/Jabong do the same? Why can't they just list the actual price payable by the customer? Is it too much maths?

PMDG 777 FPS Improvements

The PMDG T7 is finally out of the P3D but performance is quite below average. For example my system gives me 40fps with Aerosoft 320, but only 24fps with PMDG 777.

So here are few tips to get more juice out of it.

Note that I use Lenovo Y510p notebook with 4700MQ@2.8GHz with GT755M in SLI. YMMV.

Of course, backup the original files without fail before you do these modifications.

1. Change panel resolutions 

Edit the panel.cfg (Prepar3D v2\SimObjects\Airplanes\PMDG 777-200LR\panel) to make these changes.

Look for VC section from [VCockpit01] to [VCockpit40]. In each one these is this entry:

pixel_size=1024,1024

Halve these values from 1024 to 512, so that you have:

pixel_size=512,512

You can halve all 40, but I think its enough to just halve the large values like 1024 and 512 to 512 and 256 respectively. Note that one VC section has both values different, e.g. pixel_size=1024,512, so that should be halved to pixel_size=512,256.


2. Replicate Pilot's panel's to Co-Pilot

In the same panel cfg, look for [VCockpit04]. This contains Pilot's and CoPilot's MFDs.

Look for gauge03 line. In this line change the word RIGHT_INBD to LEFT_INBD.
Look for gauge04 line. In this line change the word RIGHT_OUTBD to LEFT_OUTBD.

Now co-pilot MFDs will render same as Pilot.

Note you can also change CoPilot and Center CDUs to render as Pilot's CDU in [VCockpit10], change R and C to L. Not sure if this makes much of a  performance difference.

After these two I get 27fps, up from 24fps. About 10-15% increase.

Same tips should work for FSX version also.

Enjoy!