40% of $129.50 = $51.80
$129.50 - $51.80 = $77.70
Sale Price : $77.70
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Thus the correct answer is the third one.
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Answer:
1.4
Step-by-step explanation:
You have to use cosine law...
Well to find it add the numbers up because all together they equal 540 degrees then subtract 540 to the number it add up to.