You can find one sample solution for the Week 5 Homework Problem 3 here. Other solutions such as using high capcity configurations were also accepted.

If you recognized that you needed to run an instance on Amazon EC2 and explained how you calculated the cost, you earned 3 points.

If you recognized that you needed additional storage and calculated the cost for around 1tb of storage, you received 3 points.

You should include calculations for the data that you will send back and forth when you are using the application. I did not deduct points if you missed this

You might also need to include extra cost for the data communications line that you might have to purchase at the company's end to handle the increased data transmission. In some cases, this could be absorbed by the company's existing internet connection but in many cases you will need to increase data communications capacity. No points were deducted if this was not considered..

Even if you did not include the EC2 instance and price it for 24 hours per day 31 days per month, you received full credit if you explained your calcuations.clearly.

On Problem 2, if you found any service and showed output from it, you received full credit.