GTA Online commonly has weekly discounts for products on websites like Legendary Motorsport or Warstock Cache and Carry. Furthermore, some websites also offer a 10% discount if you "stalk" their LifeInvader page.
Say the Rhino tank was 50% off and I still had the LifeInvader discount of 10%. The store page seems to display the price reduced by 50%, but other websites without discounts don't seem to factor in the LifeInvader discount either.
How, if at all, do these discounts stack? Would I have to pay 0.50 x 0.90 = 45% the original price, or 0.50 - 0.10 = 40% ?