this is the formula so far using inbuilt help, as the number range can change, from 10 to 100+
=LOOKUP(D5,{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108},{100,75,65,60,56,53,50,47,45,43,41,39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0.99,0.98,0.97,0.96,0.95,0.94,0.93,0.92,0.91,0.9,0.89,0.88,0.87,0.86,0.85,0.84,0.83,0.82,0.81,0.8,0.79,0.78,0.77,0.76,0.75,0.74,0.73,0.72,0.71,0.7,0.69,0.68,0.67,0.66,0.65,0.64,0.63,0.62,0.1,0.6,0.59,0.58,0.57,0.56,0.55,0.54,0.53,0.52,0.51,0.5,0.49,0.48,0.47,0.46})