The accounting department for sea city maryland maintains an appropriations ledger for its beautification department--supplies. the ledger shows that the amount appropriated for supplies $85,000. the ledger also shows that three purchase orders were placed, po a for $15,000, po b for $21,000, and po c for $27,000. the flowers ordered on po a arrived along with an invoice of $15,000. the soil and other supplies ordered on po b arrived, were inspected, and a voucher was approved and paid in the amount of $24,000. the trees ordered on po c had not yet arrived. according to the appropriations ledger, how much of the appropriation was available for spending?