On January 1, Wei Company begins the accounting period with a $30,000 credit balance in Allowance for Doubtful Accounts. On February 1, the company determined that $6,800 in customer accounts was uncollectible; specifically, $900 for Oakley Company and $5,900 for Brookes Company Prepare the journal entry to write off those two accounts. On June 5, the company unexpectedly received a $900 payment on a customer account, Oakley Company, that had previously been written off in part a. Prepare the entries to reinstate the account and record the cash received.

You are the manager of a large crude-oil refinery. as part of the refining process, a certain heat exchanger (operated at high temperatures and with abrasive material flowing through it) must be replaced every year. the replacement and downtime cost in the first year is $165 comma 000. this cost is expected to increase due to inflation at a rate of 7% per year for six years (i.e. until the eoy 7), at which time this particular heat exchanger will no longer be needed. if the company's cost of capital is 15% per year, how much could you afford to spend for a higher quality heat exchanger so that these annual replacement and downtime costs could be eliminated?