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1.Answer  734,641.15 $

Under SYD , The depreciation rate for each year is calculated as number of years left in an asset's life divided by sum of the digits of each year .

Here the denominator will be
= 1+2+3+4+5+6+7 .... + 14
Sum of n digits = n (n+1) / 2
Sum of 14 digits = 14(15)/2
= 105

Total depreciable value = 12,856,863

Numerator for depreciation = (14-9)+1 = 6

Depreciation rate = 6/105 * 100
= 5.714 %

Depreciation Charge
=5.714 % * 12856863
= 734,641.15 $

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3.- Machine cost = P725,801

Scrap value = 10% of cost = 725,801*(10/100) = P72,580.1 , n= 7 years

So, total depreciation accumulated (A) = cost – scrap value = 725,801 – 72,580.1 = P653,220.9

Rate of interest (r) = 20% = 0.2

So, annual depreciation by sinking fund method would be

Where, A: Total depreciation accumulated

r: interest rate for sinking fund

n: no. of years

so,ence, the required annual depreciation using sinking fund method would be P50,578.894.

please see the attached file.