openssl req -new -nodes -keyout filename.key -out filename.csr -newkey rsa:2048
The number is first multiplied by 100 to get centimes and then divided by 5 (100/5=20). Then the number obtained is only rounded down. This way you know how many 5s fit into the number. The number is then divided by 100 and multiplied by 5 so that you have CHF or francs again.