[Solved] An RDS instance runs for 10 hours with an instance class costing $0.25 per hour and uses 100 GB of gp3 storage at $0.... What is the approximate total cost for the 10 hours, ignoring backups? | AWS

AWS - RDS and Relational Databases

An RDS instance runs for 10 hours with an instance class costing $0.25 per hour and uses 100 GB of gp3 storage at $0.10 per GB-month. What is the approximate total cost for the 10 hours, ignoring backups?

A$1.04

B$2.50

C$3.50

D$0.25

Step-by-Step Solution

Solution:

Step 1: Calculate instance cost
10 hours * $0.25/hour = $2.50
Step 2: Calculate storage cost for 10 hours
100 GB * $0.10/GB-month = $10/month. Hourly rate ≈ $10 / 730 ≈ $0.0137/hour. For 10 hours: $0.14
Step 3: Sum costs
$2.50 + $0.14 = $2.64. Approximate total closest to $2.50
Final Answer:
$2.50 -> Option B
Quick Check:
Instance + prorated storage ≈ $2.64 [OK]

Quick Trick: Multiply hourly rates by hours, convert monthly storage to hourly [OK]

Common Mistakes:

Ignoring storage hourly conversion
Adding monthly storage cost directly
Misreading hourly rates

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What is the approximate total cost for the 10 hours, ignoring backups?

Step 1: Calculate instance cost

Step 2: Calculate storage cost for 10 hours

Step 3: Sum costs

Final Answer:

Quick Check:

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