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r-ruslan [8.4K]
3 years ago
12

One way to compute a 15% discount is to multiply the price by 0.15. The price of a pair of shoes is $142.20. How do i Calculate

the discount?
Mathematics
1 answer:
Elena-2011 [213]3 years ago
3 0
$142.20 x .15% = 21.33

$142.20 - 21.33 = $119.87
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2.33

Step-by-step explanation:

imagine a circle. its center is A, and it goes through B, so its radius is AB.

then it is important to know that the sum of all the angles in a triangle is 180 degrees.

one angle (at C) is 90. the angle at B is 25. so, the angle at A is 180 - 90 - 25 = 65 degrees.

more back to our circle.

in this circle the line CB is the sine of the angle at A multiplied by the radius.

and AC is the cosine of the angle at A multiplied by the radius.

we can ignore the orientation + and - of these functions, as we are only interested in the absolute length (and we can mirror the triangle, and all the angles and side lengths still stay the same).

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