 This meant that a Dehliwala with 0.59 grams of silver was now equivalent to a coin with 0.25 grams of silver.Each Dehliwala paid as tax, therefore produced an excess 0.34 grams of silver which could be used to produce "tankas".The new system served as the basis for coinage for much of the Sultanate period and even beyond, though periodic shortages of silver caused further debasement.