God level rebate system

Protagonist: Li Chuang, a wage earner who has been working for many years, returns to his hometown and spends all his savings to buy books and stationery for the students in the village, but his own pockets are empty.Accidentally received a mysterious ring from the village head, which actually opened the god-level rebate system.Spend money on yourself and get twice the return, spend it on others and get four times the return.If you're lucky, you'll be able to explode ten times and a hundred times. "You're welcome, the money for the cable car on Mount Everest...