In order for an investment to be substantial, it must meet one of the following :
It must be proportional to the total value of the particular enterprise in question;
It must be an amount normally considered necessary to establish a viable enterprise of the type contemplated (this is normally applied to new businesses.)
Please see the following scale as a guide line with regards to substantial investments :
Total Value of business or cost to start new business Minimum percentage of investment Required
Less than $500,000 75%
$500,000 to $3,000,000 50%
More than $3,000,000 30%