You have a piece of metal alloy that weighs 160.417 g. Its volume is 23.51 cm^3. The metal is an alloy (mixture) of nickel and aluminum, which have densities of 8.908 g/cm^3 and 2.70 g/cm^3, respectively. Assume there is no change in the relative volume of the individual metals as they are mixed to form the alloy. Calculate the mass percentage of nickel and aluminum in the alloy as well as the alloy's density.