Zebros Copies

Ghast has run up a debt to the copy shop by making copies of Trash World News. Help him out.

"Erase Ghast's debt to the copy shop by zeroing out his balance in the customer database (file 200) and appending a payment to the payment log (file 201) with today's date and the exact amount of his prior balance. Ghast's customer ID is available in file 300."
 * The current date can be read from the #DATE hardware register in the CLOCK host.
 * The achievement mission TONER_LOW can be completed here.