A cement manufacturer has supplied the following data: Tons of cement produced and sold 320,000 Sales revenue $ 1,024,000 Variable manufacturing expense $ 241,000 Fixed manufacturing expense $ 340,000 Variable selling and administrative expense $ 199,320 Fixed selling and administrative expense $ 101,000 Net operating income $ 142,680 The company's contribution margin ratio is closest to: Multiple Choice 43.3% 62.0% 66.8% 13.9%

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