Ask EC2 what the account is running:

aws ec2 describe-instances

Now compare three sizes. describe-instance-types describes any types you name; the --query picks three fields from each entry, written as a list in square brackets, so the table has one column per field:

aws ec2 describe-instance-types --instance-types t3.micro t3.small m5.large --query "InstanceTypes[].[InstanceType,VCpuInfo.DefaultVCpus,MemoryInfo.SizeInMiB]" --output table

Answer from the table and from the lesson's prices.