A quadrilateral has exactly 3 congruent sides, someone thinks it is a rectangle, why is that someone wrong?

It is because a rectangle has 4 congruent sides.

A rectangle has 4 congruent sides since it has four 90 degrees sides, its corners. This someone say a shape with 3 congruent sides is a rectangle.

This is why it is wrong.

wholesale price is the initial price before markup. retail price comes after the markup.

a price of 8 bucks that's marked up by 100%   is

formula: initial price + (percent markup in fraction/decimal)(initial price)

8+(1)(8)

8+8

16

retail price is $16.

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