If the percent error is 3% and the target amount is 50, what is the lowest acceptable value?
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if the percent error is 3% and the target amount is 50, what is the highest acceptable value?

Percent error is 3%target amount is 50

3% of 50 = turn percent to decimal" of " means multiply
0.03(50) = 1.50

Lowest acceptable value is : 50 - 1.50 = $ 48.50 <==
Highest acceptable value is : 50 + 1.50 = $ 51.50 <==

The correct graph is the second one, with the points being at (-6,0), (2,0) and reaching down to (-2,-8)