bits and pieces

At a bakery, Rey refused to go when I called him several times.
I: Do you want to buy the swiss rolls?
R: No, mum. But I think there is a mistake. You see, it says "1 for 70 cents, 3 for $2".
Why? It should be "3 for $2.10" right?
And so I have to explain some sales tactic to him.
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I guess Rey was observing me today when I inquired about discounts for a toy, and later a dress.
(queueing at the entrance of a dressing room where the ladies' husbands were waiting for their darling wives to try out new dresses)
R: Mum, why do you like DISCOUNTS so much?
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We were talking about "perfection" about why people can never be perfect and why we can say someone did a 'perfect' job or score 'perfect marks' for a test.

R: I know, people who are perfect are 'Perfect-tional' right?
I: Eerr, that is "Professional" dear.
And then the chit-chat goes on about "the pros and cons of being a perfectionist" and meaning of 'professional".