<?php
$valor = 10000;
$percentuais = Array(0.41, 0.42, 0.43, 0.44, 0.5, 0.6); $percentual = $valor > 80000 ? 5 : $percentuais[($valor - 1) / 5000];
echo $percentual;
//https://pt.stackoverflow.com/q/439700/101
PD9waHAKJHZhbG9yID0gMTAwMDA7CiRwZXJjZW50dWFpcyA9IEFycmF5KDAuNDEsIDAuNDIsIDAuNDMsIDAuNDQsIDAuNSwgMC42KTsKJHBlcmNlbnR1YWwgPSAkdmFsb3IgPiA4MDAwMCA/IDUgOiAkcGVyY2VudHVhaXNbKCR2YWxvciAtIDEpIC8gNTAwMF07CmVjaG8gJHBlcmNlbnR1YWw7CgovL2h0dHBzOi8vcHQuc3RhY2tvdmVyZmxvdy5jb20vcS80Mzk3MDAvMTAx