GrowSustain Inc key information table:

Payout Ratio - 0%

Net Income - 25 million

Beginning Stockholders' Equity - 125 million

Beginning Total Assets - 200 million

End Total Assets - 180 million

Using the information of GrowSustain Inc in the above table, calculate its:

a) Internal growth rate.

b) Sustainable growth rate.

c) Sustainable growth rate if it pays out 20% of its net income as a dividend.