How to record greater than 50 in a cell so it reads as greater than 50

I have to make a table that shows that a if someone purchases

less than 5 items they receive no discount
5-10 items they receive 2% discount
11-20 items they receive 5% discount
21-50 items they receive 8% discount
over 50 items they receive 10%

and it has to be done in a way that the discount rate can be calculated using Vlookup I am struggling to find the best way to write this table. i tried numbering 1 to 50 and writing the corresponding discount rate in the second column but this looks untidy and can't calculate greater than 50 as i am not sure how to write it in the cell so it reads as >50 and not just 50.

Please help it's urgent