Relevant and irrelevant costs:
1.DeCesare Computers makes 5,200 units of a circuit board, CB76 at a cost of $280 each. Variable costper unit is $190 and fixed cost per unit is $90. Peach Electronics offers to supply 5,200 units of CB76 for$260. If DeCesare buys from Peach it will be able to save $10 per unit in fixed costs but continue to incurthe remaining $80 per unit. Should DeCesare accept Peach’s offer? Explain.
2.LN Manufacturing is deciding whether to keep or replace an old machine. It obtains the followinginformation:
Old Machine
New Machine
Original cost
$10,700
$9,000
Useful life
10 years
3 years
Current
age 7 years
0 years
Remaining useful life
Accumulated depreciation
$7,490
Not acquired yet
Book value
$3,210
Current disposal value (in cash
) $2,200
Terminal disposal value (3 years from now)
$0
Annual cash operating costs
$17,500
$15,500
LN Manufacturing uses straight-line depreciation. Ignore the time value of money and income taxes.
Should LN Manufacturing replace the old machine? Explain.
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