Riddles!

[Yonah]

Someone wants to buy an item that costs $100. They have three stacking discounts of 20%,5% and 10% - for a total of 35% off.  They add the items to their cart, they apply the discounts, but instead of the expected price of $65 their total comes out to be $68.40 before any taxes or shipping charges. They called the support line and are told the calculation is accurate - what happened?

A friend of theirs had two stacking discounts - of 25% and 10%, and got a different price - also not $65, but not $68.40 - what was their price?

[yungermanchik]

1)Someone wants to buy an item that costs $100. They have three stacking discounts of 20%,5% and 10% - for a total of 35% off.  They add the items to their cart, they apply the discounts, but instead of the expected price of $65 their total comes out to be $68.40 before any taxes or shipping charges. They called the support line and are told the calculation is accurate - what happened?

2)A friend of theirs had two stacking discounts - of 25% and 10%, and got a different price - also not $65, but not $68.40 - what was their price?

1) 100x.80x.95x.90
2)67.50

[Yehudaa]

Someone wants to buy an item that costs $100. They have three stacking discounts of 20%,5% and 10% - for a total of 35% off.  They add the items to their cart, they apply the discounts, but instead of the expected price of $65 their total comes out to be $68.40 before any taxes or shipping charges. They called the support line and are told the calculation is accurate - what happened?

A friend of theirs had two stacking discounts - of 25% and 10%, and got a different price - also not $65, but not $68.40 - what was their price?

@Dan can walk you through the math here:

https://www.dansdeals.com/shopping-deals/apparel-deals/clothing/smoking-hot-brooks-brothers-black-friday-sale-120-non-iron-dress-shirts-low-21-82-shipped-multiple-stacking-pr

[Yo ssi]

Anybody familiar with the hat riddle?

https://ed.ted.com/lessons/can-you-solve-the-prisoner-hat-riddle-alex-gendler