r's complement of an n-digit number in base r is defined as r^n-N for all N except 0.
for 0, the r's complement is 0 itself.
-Morris Mano
For finding 10's complement of a number, leave all least significant 0's unchanged, subtract first non zero least significant number from 10 and the rest of digits from 9.
Hence, for 10's complement of 00,000,000: leave all 0's unchanged. Hence the solution is: 00,000,000