You took the 16% and made it .16. Totally fine. But once you made it .00000000whateveritwas. You have to revert it back to its original percent......which is 77. Lol
Ok. Lets approach it another way. 1/6 * 1/6 * 1/6 * 1/6 or (1/6)^4 which gives you 1/(6*6*6*6)
Broken down 1(6*6*6*6) = 1/(36*6*6) = 1/(216*6) = 1/(1296) = 7.716 x10^-4 = 0.0007716 = 0.00077%