21 5 Amazun has depusited $250,000 in a maintenance fund for their trucks. A study has suggested tn not purchase new tmclcs, but rather set up this fund to pay for what is expected to be increasing maintenance casts ever a time windcw cf the next 10 years. It has been estimated that truck casts next year will be $35,000, and that they will increase by some xed amuurlt year alter year thereafter. lfAmazon uses an interest rate of 30%, what is the maximum fixed gradient of increase that can be supgcrted by the maintenance fund