A student weighs a potato cylinder at 5.0 g and, after 24 hours in a salt solution, 4.4 g. What is the percentage change in mass?

Answer and explanation

Correct answer: C. −12%

  1. Step 1: Mass change = 4.4 − 5.0 = −0.6 g.
  2. Step 2: Percentage change = −0.6 ÷ 5.0 × 100 = −12%.
Answer
−12%.
Why not the others: +12%: the sign is wrong. −0.6%: this is the mass change, not a percentage. −13.6%: the change was divided by the final mass.

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