medium Drill: rough monthly cloud bill
Drill
A service stores 500 TB in object storage, runs 100 vCPUs 24/7, and serves 50 TB/month egress. Estimate the monthly cost (anchors: $0.02/GB-mo storage, $0.05/vCPU-hr, $0.09/GB egress).
✅ Worked solution & bounds check
Worked solution
- Storage: 500,000 GB × $0.02 = $10,000/mo.
- Compute: 100 × $0.05 × 730 hr ≈ $3,650/mo (spot ≈ ~$1,000).
- Egress: 50,000 GB × $0.09 = $4,500/mo.
- Total ≈ $18K/month.
Insight: storage + egress dominate. Levers: tier cold data to archive; put a CDN in front to cut egress; use spot instances for compute.
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