Mathematics: Katie borrowed $550. Four months later, she sent a cheque for $562.83 to repay the loan and interest. What was the interest rate charged?

Katie borrowed $550. Four months later, she sent - id5508307926, DragonWarrior203

bobby1415

28.02.2023

The ratio of white:milk:dark is 9:8:4

Explantion:

Let w represent white chocolate , m represent milk chocolate and d represent dark chocolate

The ratio of white to not white is 3:4

Here not white means , it can be milk or dark chocolate

Then

w : (m+d) = 3:4 -----------------------------(1)

The ratio of not dark to dark is 17:4.

Again not dark means , it will be white or milk chocolate

Then,

(w+m) : d = 17:4 -----------------------------(2)

Representing (1) in fractions

$\frac{w}{m+d} =\frac{3}{4}$

4w = 3(m+d)

4w = 3m +3d

4w -3m =3d------------------------------(3)

Representing (2) in fractions

$\frac{(w+m)}{d}= \frac{17}{4}$

4(w+m) = 17d

4w +4m = 17d---------------------------(4)

Subtracting (3) from (4)

4w +4m = 17d

4w -3m = 3d

(-)

-------------------------------

7m = 14d

-------------------------------

$\frac{m}{d} = \frac{14}{7}$

$\frac{m}{d} = \frac{2}{1}$

m:d = 2:1

Since w:(m+d)=3:4 let's make m:d a multiple of 4.

m:d = 8:4

w : (m+d) = 3:4 = 9:12

w:m:d = 9:8:4

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