In the sun, suppose the value of E (energy production per second per gram) drops to 1% of its central value at r/R = .02, which can be taken as the outer boundary of the solar core. Assume E==pT^4 where p is density and T is temperature. You have this data: T(at r=0) = 16 million K and T(at r/R=0.2) = 8 million K. By what factor has the density dropped in the core from center to outer edge?