I make it to be about an 80/20 mix of canola to palm based on this - (bear with me!)
100g oil has 14.5g saturated fat
Palm is made up of 51% saturated fat, canola is 6%. So we can see that it won't be made up of more palm than canola or the amount of saturated would be higher.
((100g / 100 )* 20 ) * 0.51 gives us 10.2. What this tells us is that the amount measured on the label divided by 100 to get a percentable figure, multiplied by an estimated ratio of palm and then adjusted for how much of the palm is saturated gives us how much saturated fat would be in something is palm made up 20% of it.
Do the same for the canola -
((100g / 100) * 80) * 0.06 gives us 4.8 - so a 100g mix with 80% canola will have 4.8g saturated fat.
Add the two together and we have 15g saturated fat per 100g from an 80% canola and 20% palm mix. So it's more like 81/19 rather than 80/20.
For those wondering, I made a spreadsheet with the figures in and just adjusted the ratio of palm to canola, making sure it added up to 100 of course. Starting at 75/25 (it clearly wasn't 50/50!) I saw I was close, so the next was 80/20.
But don't take my word for it - please, someone else who is better at maths or chemistry (where is Dee when we need her?) can either confirm this or save you from making a mistake