Question

how to get log antilog of this sum - 47.37×1.921×771

Answer 1

log [47.37X1.921X771 ]
we know
log [ a * b * c ] = log a +  log b log c
thus
log [47.37X1.921X771] = log 47.37+ log 1.921+log771
                                     = 1.67 + 0.28 + 2.88
                                     = 4.83
Similarly 
antilog [ 47.37X1.921X771 ] = 3.85 + 0.65 + 6.64
                                              = 11.14