Business Maths - Q & A thread.

[Dominator]

Can someone please help me with question 4a in Exercise 21B (Essential Further Mathematics Third Edition)?

The answer is $1.90. (However, I obtained an answer of $2.12).

BUMP please!

Edit: Refer to my previous post for the attachment!

[Comatose]

9) A stereo system purchased for $1200 incurs 12% per annum reducing balance depreciation.
a)find the book value after 7 years: correct ($490.41)
b)What is total depreciation after 7 years? (709.59) correct.
c)If the stereo has a scrap value of $215, in which year will this value be reached: Answer (14th year) ?

If any1 has suggested solutions for 21F Q9-28 for Further Maths Essentials 3rd edition please pm me.

14 years seems about right
use the calculator:

[Comatose]

Can someone please help me with question 4a in Exercise 21B (Essential Further Mathematics Third Edition)?

The answer is $1.90. (However, I obtained an answer of $2.12).

i think book is wrong?
1 may - 6 may = 650.72 x (5/365) x (3/100) = 0.2674
6 may - 19 may = 445.82 x (13/365) x (3/100) = 0.4764
19 may - 1 june = 1241.37 x (13/365) x (3/100) = 1.2244

therefore, total interest in that month = 0.2674 + 0.4764 + 1.2244 = 1.9682 = $1.97

[MJRomeo81]

The answer is $1.90. (However, I obtained an answer of $2.12).

I also think the book is wrong.

 

9) A stereo system purchased for $1200 incurs 12% per annum reducing balance depreciation.
a)find the book value after 7 years: correct ($490.41)
b)What is total depreciation after 7 years? (709.59) correct.
c)If the stereo has a scrap value of $215, in which year will this value be reached: Answer (14th year) ?

If any1 has suggested solutions for 21F Q9-28 for Further Maths Essentials 3rd edition please pm me.

14 years seems about right
use the calculator:

(Image removed from quote.)

I got the same answer, except I used the solve function.

solve(215=1200X (1-12/100)^x,x    (find x)
x = 13.45, hence the answer is 14 years.