Tara works as a programmer for xyz electronics company. about one month ago, tara bought 500 shares of a small start-up firm with great technology because she heard rumors from the cfo's secretary that xyz was planning to purchase the smaller company and give it an infusion of cash. yesterday, xyz announced the decision to buy the small firm, which significantly increased the small company's stock price. tara most likely performed her trade based upon:
a. public informationb. xyz's treasury stockc. faulty informationd. insider trading information

Xinhong company is considering replacing one of its manufacturing machines. the machine has a book value of $39,000 and a remaining useful life of 5 years, at which time its salvage value will be zero. it has a current market value of $49,000. variable manufacturing costs are $33,300 per year for this machine. information on two alternative replacement machines follows. alternative a alternative b cost $ 115,000 $ 117,000 variable manufacturing costs per year 22,900 10,100 1. calculate the total change in net income if alternative a and b is adopted. 2. should xinhong keep or replace its manufacturing machine