Buffalo Company sold $8,910 of its specialty shelving to Elkins Office Supply Co. on account. Prepare the entries when (a) Buffalo makes the sale. (If no entry is required, select "No Entry" for the account titles and enter O for the amounts. Credit account titles are automatically indented when the amount is entered. Do not indent manually.) (b) Buffalo grants an allowance of $706 when some of the shelving does not meet exact specifications but still could be sold by Elkins. (If no entry is required, select "No Entry" for the account titles and enter 0 for the amounts. Credit account titles are automatically indented when the amount is entered. Do not indent manually.) (c) at year-end. Buffalo estimates that an additional $206 in allowances will be granted to Elkins. (If no entry is required, select "No Entry" for the account titles and enter O for the amounts. Credit account titles are automatically indented when the amount is entered. Do not indent manually.)