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Title: Financial Maths
Description: Notes about calculating the interest and mark up and discount prices.

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Math No
otes 
 

Chap
pter 1 Financial Maths
1
...


 

 
 as a de
ecimal
...
35

You could also
o write 

62
6

 

 
Increasin
ng or decrea
asing by a giv
ven percenta
age 
A percen
ntage can als
so represent
t a change in  a quantity
...
 

Multiplier 
 
Multiplie
er for Increase = 100% + %Increase 
 

Y  
You then nee
ed to conver
rt 
to a de
ecimal 

Multiplie
er for Decrea
ase = 100% ‐
‐ %Decrease   
 
 
 
 
 
 
 

 
New
w Amount
t = Multiplier × O
Old Amou
unt 
 

 
Writing one amount
t as a percentage of anot
ther 
 
e one amoun
nt as percentage of anoth
her first mak
ke sure they a
are in the sa me unit
...


...
 
 

1
...
 It is usually expressed as
s a percentage
...
 
 
Multiplie
er for Decrea
ase = 100% ‐
‐ %Decrease   
 
 
   
  New
w Amount
t = Multiplier × O
Old Amou
unt 
 
 
 
Profit an
nd Loss 
 
The man
nufacturers a
and retailers need to ma ke a profit
...
 They w
will 
then add
d on a mark up to obtain
n the selling  price
...
 
If the selling price is less than the
 
 
 
 
 
Profit or
r loss can be expressed as percentage
e of the cost
t price or the
e selling price
e
...
 We can us
se the multip
plier for incre
easing an am
mount
...
 
To find t
 
New Am
mount = Mult
tiplier × Old A
Amount 
 
 
 
 
 
 
 
 

New Amou
unt
Old Amo 
d
ount
Mul
ltiplier
r

 


Title: Financial Maths
Description: Notes about calculating the interest and mark up and discount prices.