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Pleeeease help me please

Pleeeease help me please-example-1
User Amit Patel
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((y_(2) - y_(1))/(y_(1))) \cdot 100 \% = ((30-32.5)/(32.5)) \cdot 100 \% = -7.6923076923076923076923076923077 \approx -7.7 \%.
User Nahsivar
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