Answer:
Number of white marbles in the bag = 45
Step-by-step explanation:
Total number of marbles in the bag = 135
Ratio of white marble to transparent ones = 3 : 6
Let number of white marbles be 
Then number of transparent marble will be 
Total number of marbles will be 
So we have.

Dividing both sides by 9.

∴ 
∴ Number of white marbles in the bag = 
1550 * 0.2279 / 12 ( monthly interest is 1/12 of APR)
= $29.43
C is the answer to the best of my knowledge
John invested the money at simple interest for 4.22 years.
We have,
Invested amount = $ 4500
Rate of interest = 5.5 %
Time = t years
Maturity value = $ 5545
So,
Total interest earned = $ 5545 - $ 4500 = $ 1045
And,
Simple interest = (Principal × Rate × Time ) / 100
So, Using the mentioned formula,
1045 = ( 4500 × 5.5 × t ) /100
1045 = 45 × 5.5 × t
⇒
t = (1045) / (45 × 5.5)
⇒ t = 4.22 years
Therefore, John invested the money at simple interest for 4.22 years.
Learn more about simple interest here:
brainly.com/question/22621039
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You can use this one app it’s called Cymath it’s really helpful with these types of problems,