Your Majesty, Go Collect the Waste! Otherwise, the Country Will Be Gone!

This emperor doesn't show off: he works hard to make money! Otherwise, the country will be gone! After collecting the rags at the beginning, he really wanted to go back in time. However, the system requires making 10 billion within a year, just by collecting scraps? Is this true? Is this possible? What I want to do is to do what ordinary people cannot!