40% off your entire purchase is the same as 20% off each item, right?

I was shopping with my daughter recently and we were in a store that had signs everywhere announcing "40% off Your Entire Purchase".  

Some young (and not so young) ladies were at the checkout in front of us with 2 pairs of jeans.  One of them asked, "so it's 20% off each item right?" 

 The cashier said, "Yes, well... It's 40% off your entire purchase.  So yea, that's the same thing, yea, it's the same as 20% off each item."  

Hmmmm.  

Let's say the jeans were $50 each.  20% off of one pair would make them $40 each (or $80 total).

Let's try that with 40% off of your entire purchase.  Two pairs of jeans would cost $100.  40% off the entire purchase would make the total $60.  Think I'd rather have 40% off the total :).

 

This fabric has more than 100% contents~ hmmm.

What's half of $25?

So I was at a nameless doctor's office and a man came in to pay his bill.  
"I would like to pay on my bill, how much do I owe?" he asked the financial secretary.

"You owe $25.00, how much would you like to pay?"

"I'll pay half," the man responded.  "How much would that be?"  

The financial secretary proceeded to get out her calculator.

I couldn't resist, I said, "It would be $12.50 right?  Half of $24 is $12, split the last dollar in half to get 50 cents more."

Both the man and financial secretary looked at me, then looked at each other,  then proceeded to take out their calculators.  

Guess they didn't trust my reasoning :)

 

Magazine makes error on cover!

  I tried to figure out how they might have made the error and this is what I came up with.  What do you think? 

 I'm thinking a number line might have helped with this one!

You save $12.00 ?

This math fail needs little explanation!