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If fixing a bug during requirements costs $200, and fixing it during design costs 3 times more, what is the cost difference between fixing it during design and maintenance if maintenance costs 8 times more than requirements?

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Testing Fundamentals - Why Software Testing Matters
If fixing a bug during requirements costs $200, and fixing it during design costs 3 times more, what is the cost difference between fixing it during design and maintenance if maintenance costs 8 times more than requirements?
A$1200
B$800
C$100
D$1000
Step-by-Step Solution
Solution:
  1. Step 1: Calculate design and maintenance costs

    Design cost = 3 * 200 = $600; Maintenance cost = 8 * 200 = $1600.
  2. Step 2: Find cost difference

    Difference = Maintenance - Design = 1600 - 600 = $1000.
  3. Final Answer:

    $1000 -> Option D
  4. Quick Check:

    Cost difference = $1000 [OK]
Quick Trick: Subtract design cost from maintenance cost [OK]
Common Mistakes:
  • Adding costs instead of subtracting
  • Using wrong multipliers
  • Confusing design and maintenance costs

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