excel一个数字乘以一个区间值，求公式

=LOOKUP(A1,{1,6,11,16,21,26,31,36,41,46,51,56,61,66,71,76,81,86,91,96},{"A","还止B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T"}