Here is a rule:

Earn 1$ - 3$ in offerwall get 5% to your account balance
Earn 3.1$ - 5$ in offerwall get 15% to your account balance
Earn 5.1$ - 10$ in offerwall get 25% to your account balance
Earn 10.1$ - > in offerwall get 45% to your account balance


Rewards will be added at the end of every month!!