Answer:
B = 80
Step-by-step explanation:
y = 4x
y = 1/2x + 280
Substitute one equation into another.
4x = 1/2x + 280
Combine like terms
3.5x = 280
x = 80
Answer:
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Step-by-step explanation:
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The 80% of 50 is 40$
So the sale is 20% which is 10$