Convert a number to a letter code

Hello,

This is to change a number to a code of letters to hide info in plain site.

if my code table is 1 = C, 2 = D, 3 = E, etc thru 9 = K and 0 = P

so if my cost shows as 24.76 it returns DFIH

or " " 130.90 " " CEPKP


So I can then print this letter code on my tag, thus knowing my cost without my clients figuring it out.