Sentence:  Three-sevenths, or 300,000 <WSD>tangas</WSD> (100,000 Kabul rupees) were remitted to the Amir as tribute, whilst the remaining sum, 400,000 <WSD>tangas</WSD> (Rs. 133,333), was retained by the wali for his own expenses. 
Meaning of the word marked with <WSD> tags:  Any of various former Asian coins, including: a coin of Portuguese India equal to 1/10th of a Rupee, a gold coin of India issued by various Muslim rulers, a silver coin of India, also issued by Muslim rulers, a former silver coin of Tibet.