The Cashier’s Error

The customer said to the cashier: “I have 2 packages of lard at 9 cents, 2 cakes of soap at 27 cents, and 3 packages of sugar and 6 pastries, but I don’ remember the prices of the sugar and pastries.”

“That will be $2.92.”

The customer said: ” You have made a mistake.”

The cashier checked again and agreed.

How did the customer spot the error?

Nalin Pithwa

2 Comments

  1. Anubhav C. Singh
    Posted September 8, 2016 at 4:19 pm | Permalink | Reply

    Calculating total cost (keeping no. of packets of sugar to be x and pastries to be y;)
    2*0.09+2*0.27+3x+6y=2.92
    3(0.06+0.18+x+2y)=2.92

    Now we see that the total cost of products(2.92) should be divisible by 3, which is not, and one can’t pay in fractional recurring decimals(technology not that advanced), the cashier has to have made a mistake somewhere.

    Unless his machine rounded off the calculation for him.

  2. Posted September 8, 2016 at 9:59 pm | Permalink | Reply

    🙂

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