[Translation from Japanese to English ] If we can make this a mutually beneficial transaction, I will keep purchasing...

Original text

お互いに取って利益のある取引にすることができれば、今後も継続的にあなたから多くの○○を購入するでしょう。○○の顧客をたくさん日本で持っているのであなたとぜひ関係を築きたいと考えています。

Translation / English

If we can make this a mutually beneficial transaction, I will keep purchasing a large quantity of OO from you. As I have many customers who want OO in Japan, I would love to establish a business relationship with you.

Translation / English

If this transaction will turn out to be profittable for both of us, we will continue to purchase a lot of xx from you. We have a large number of customers for xx in Japan, and wish to build up a good relationship with you.