As mentioned earlier, every time you 'Add Funds' to your Reseller Account, your Total Receipts will increase. Once your total amount of “adding funds” reaches the next level of account, your account will be upgraded and you enjoy a better price.
So, if you have made $98.90 to have Bronze level account, you just need to make another ($234.75-$98.90=$135.85) to have Silver Level account.