Using the three trigonometric functions can be used to calculate unknown side lengths and angle in a right-angle triangle only.
But, if ever you we're given to find a non right-angle triangle, you will have to use sine rule or cosine rule.
Answer:
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Step-by-step explanation:
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20.50 * 0.8 = $16.40
16.40 * 0.4 = $6.56
Final selling price = $6.56