With 8 digits, there are 100,000,000 possible numbers, from 00,000,000 to 99,999,999.
For numbers with only even digits, there are 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 = 390,625 possible.
390,625/100,000,000 = .0039625.
96,000,00 x .0039625 = 375,000.