A trader has asked me to bring him goods from China since he doesn`t have the money to do so. He added me to a mortgage deed and I wrote him a post-dated cheque until we returned from that country. We have also agreed on a fixed percentage of profit. Accordingly, we went to China, he choose the goods, I paid for them and took responsibility of delivering them to Amman. Moreover, he gave me cheques that covered the whole amount I had given him, in addition to the profit. What is the ruling of Sharia on this transaction?