A 7075-aluminum alloy is commonly used to build commercial aircraft. A newly developed Al-Li alloy is being considered to replace the 7075 alloy. The following Table shows the composition of both alloys. a. Determine the density of the 7075 alloy. b. Determine the density of Al-Li alloy. c. Suppose a total mass of of 68,000 kg of 7075 alloys is currently used on the aircraft, what net mass reduction would result from the substitution of the Al-Li alloy Alloy 7075 Al-Li Li 2.0 Primary alloying elements (wt %) Cu Mg Cr 1.6 2.5 0.23 3.0 Zn 5.6 Zr 0.12