Which of the following control activities would best protect against the preparation of improper or inaccurate cash disbursement?
1. all checks must be signed by an officer designed by the board of directors.
2. all signed checks must be reviewed and compared to supporting documents by the treasurer before mailing.
3. all checks must be sequentially numbered and accounted for by the internal auditors.
4. all checks must be perforated or otherwise effectively canceled when they are returned from the bank.

Afirm plans to begin production of a new small appliance. the manager must decide whether to purchase the motors for the appliance from a vendor at $10 each or to produce them in-house. either of two processes could be used for in-house production; process a would have an annual fixed cost of $200,000 and a variable cost of $7 per unit, and process b would have an annual fixed cost of $175,000 and a variable cost of $8 per unit. determine the range of annual volume for which each of the alternatives would be best. (round your first answer to the nearest whole number. include the indifference value itself in this answer.)