The capital costs should be recovered in 15 years. 预计投入将在15年内赚回。

What makes you say that? 你凭什么这样说呢？ 

The amount of outlets is gradually increasing now, which will improve the quality of service greatly. 目前我们正逐步增加营业网点，服务质量将会因此大大提高。

The amount of outlets is gradually increasing now, which will improve the quality of service greatly. 目前我们正逐步增加营业网点，服务质量将会因此大大提高。

Well done. 做得好。