ลูกค้าหลักคือบริษัทแม่ซึ่งประมาณ70%

ลูกค้าหลักคือบริษัทแม่ซึ่งประมาณ70%ของยอดขาย

Results (English) 1:

The main customer is the parent company of which approximately 70% of sales.

Results (English) 2:

The main customer is the parent company of which about 70% of sales.

Results (English) 3:

The main customers are the parent company, which is about 70% of sales.