For Further Financing till What Limit Debt/Equity Ratio is acceptable ? Please Advise

Well professionals said1:1 ratio is reasonable but not a final. In today's market early business stages rely heavily on equity financing rather debt because of cash flow surety.

the optimal capital structure ( debt/equity mix ) is the capital structure that minimizes the weighted average cost of capital  {sum ( Wi * Ci )}

_ debt is lower cost than equity

There is no such standard or fixed rule for ideal D/E ratio. But as a thumb rule its1.33. But again it depends on the industry type you are dealing. Let say in construction industry the D/E ratio is normally high as major construction work are done by debt funding.

60%you must be contain that ratio4 smooth survival