////Straight Line Depreciation
Straight Line Depreciation2018-12-04T08:21:15+10:00

Maths Made Easy Forums Standard Finance Interest & Depreciation Straight Line Depreciation

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    Jill bought a new car for $55,000. In the first year the value of the car depreciated by 20%. In the second year, the car depreciated by 15%. In the third year, the value depreciated by 10%. What is the percentage value of the car now of its original price?

    = 55,000 × 80% × 85% × 90%

    = $33,660

    If the car went down by 20% – this means it is now only 80% of its original value (100% – 20% = 80%)
    then it went down by 15%: 100% – 15% = 85%
    then it went down by a further 10%: 100% – 10% = 90%
    to find the value of the car now we can just multiply by each percent (rather than finding out individual values and subtracting) – this method is called ‘successive dicsounts’

    $$=\frac{33660}{55000}\times100

    = 61.2%

    now we need to find the value of the original as a percent, so the new value over the old value, times 100

  • AdminAdmin

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    Ryan is a tradesman who receives a weekly salary of $1500. He bought new tools for $2600 on 30 September and calculates depreciation using the declining balance method at a rate of 12% per annum.
    a. What is Ryan’s gross annual income?
    b.Calculate Ryan’s taxable income for this financial year if the only tax deduction is the depreciation for his tools.
    c. Use the tax table (below) to calculate Ryan’s tax payable.
    d.What is the salvage value of the tools after the first financial year?
    e. What is the allowable tax deduction in the next financial year?

    a. Income = $1,500 × 52
    = $78,000

    b. 9 months worth of depreciation
    $2,600 × 0.12 = $312
    for the 9 months = $312 × 9/12
    = $234
    Taxable income = $78,000 – $234
    = $77,766

    c.

    TAXABLE INCOME TAX  
    $0 – $6000 Nil Nil
    $6001 – $35,000 Nil 15c for each $1 in excess of $6000
    $35,001 – $80,000 $4350 30c for each $1 in excess of $35,000
    $80,001 – $180,000 $17,850 38c for each $1 in excess of $80,000
    $180,001 and over $55,850 45c for each $1 in excess of $180,000

    tax = $4,350 + 0.30(77,766 – 35,000)
    = $17,179.80

    d. Value after first year = $2,600 – $234
    = $2,366

    e. tax deduction after another year = $2,366 × 0.12
    = $283.92

  • AdminAdmin

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    Time Years

    0
    1
    2
    3
    4
    5
      Value $
    9400
    8460
    7614
    6853
    6167
    5551

    The table shows the value of the Big Red carpet cleaning machine over 5 years.
    What is the rate of the depreciation of the machine?

    look at any year’s drop – you only need to do one, but we have done a few to illustrate that it makes no difference which ones you pick

    8460/9400 × 100 = 90% ie, it is 90% of what it used to be, so it depreciated by 10%

    6853/7614 × 100 = 90.005%

    5551/6167 × 100 = 90.01%

    it won’t matter which two you pick, as long as they are consecutive, will always give you 90%

    so if 90% is left, it depreciated by 10%pa

  • AdminAdmin

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    Post count: 582

    In January 2004, the Coco Dog Food Company purchased a new packaging machine which cost $36500. After 3 years the salvage value of the machine was $12500.
    a. If the straight line method is used, find the annual amount of depreciation.
    b. If the declining balance method is used, find the annual depreciation rate, correct to 1 decimal place.
    c. The company decides to sell the machine after 4 years. Which method of depreciation would you suggest the company use in order to gain the greatest tax benefit? Support your answer with mathematical calculations.

    a. Depreciation = $36,500 – $12,500
    = $24,000 annually
    = $24,000 ÷ 3
    = $8,000

    b.12,500 = 36,500(1 – r)3
    $$\frac{12,500}{36,500}=(1-r)^3$$
    $$\sqrt[3]{{\frac{{25}}{{73}}}} = 1 – r$$
    0.699636 = 1 – r
    -0.30036 = -r
    r = 0.300
    ∴ 30.0%

    c. after 4 years

    Straight Line Method   Declining Balance Method
    V = 36,500 – 4 × 8,000 = $4500
    Total depreciation = $36,500 – $4,500
    = $32,000
      V = 36,500(1 – 0.3)4 = $8763.65
    Total depreciation = $36,500 – $8763.65
    = $27,736.35

    ∴ Greatest tax benefit will be with the straight line method as there is more tax deductions to claim

  • AdminAdmin

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    A car was purchased for $20,000. It depreciates at a rate of 10% of its purchase price each year. What is the value of the car after 6 years?

    Find 10% of the purchase price of $20,000
    = 20,000 × 10%
    = $2000

    Use the straight line depreciation formula: S = V0 – Dn

    S = 20,000 – 2000 × 6

    = $8000

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