You have been asked to test the effectiveness of ingo corporation's control of manually approving all purchases over $25,000. during the year, ingo corporation has made 1,000,000 purchases, of which 3,000 were over $25,000. jian zhang, cia, your supervisor, has asked you to use a tolerable deviation rate of 4 percent (although she expects the rate to be only approximately 0.25 percent) and a 5 percent risk of assessing control risk too low.