Frame supplies income statement for the year ended december 31, year 1 sales $ 64,450 cost of goods sold (39,480 ) gross margin 24,970 operating expenses (8,925 ) net income $ 16,045 during the year-end audit, the following errors were discovered: an $1,083 payment for repairs was erroneously charged to the cost of goods sold account. (assume that the perpetual inventory system is used.) sales to customers for $2,868 at december 31, year 1, were not recorded in the books for year 1. also, the $1,007 cost of goods sold was not recorded. a mathematical error was made in determining ending inventory. ending inventory was understated by $1,064. (the inventory account was mistakenly written down to the cost of goods sold account.) determine the effect, if any, of each of the errors on the following items. give the dollar amount of the effect and whether it would overstate (o), understate (u), or not affect (na) the account. the first item for each eror is recorded as an example.