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Masteriza [31]
3 years ago
14

The beginning balance of Cooper's savings account for the month of September was $5700, and it remained this way for the first 1

1 days of the month. On September 12, Cooper made a withdrawal of $900, so his balance changed, and it remained the same for a total of 9 days. On September 20, Cooper made a deposit of $1100, so his balance changed again, and it remained the same for a total of 10 days to finish out the month. Cooper's savings account has an APR of 3.65%, calculates interest daily, and pays interest at the end of the month. Cooper wants to calculate the amount he earned in interest during the month of September. (5 points: Part I – 1 point; Part II – 1 point; Part III – 1 point; Part IV – 1 point; Part V – 1 point)
Part I: What interest rate does Cooper's savings account pay per day?

Daily interest rate: 0.01%



Part II: How much did Cooper earn in interest during the first 11 days of September?

Interest earned after 11 days: $6.27


Part III: How much did Cooper earn in interest during the next 9 days of September?





Part IV: How much did Cooper earn in interest during the last 10 days of September?



Part V: How much did Cooper earn in interest during the month of September?
Advanced Placement (AP)
1 answer:
algol [13]3 years ago
8 0

He earned 6% interest in the month of September

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Need Assistance With This​
vaieri [72.5K]

Answer:

If the question is (2/3x) = -10,

x = -(1/15) = - 0.06667

The check is presented under the explanation below

If the correct question is (2/3)x = -10,

x = -15

The check is presented under the explanation below

Explanation:

If the question is rightly written as it is in the attached document,

(2/3x) = -10

We can cross multiply and obtain

2 = -10 × 3x

-30x = 2

x = -(2/30) = -(1/15) = - 0.06667

To check

(2/3x) = -10,

(2 ÷ 3x) = -10

2 ÷ 3(-1/15) = 2 ÷ (-1/5) = 2 ÷ (-0.2) = -10 (Correct!)

If the correct question is

(2/3)x = -10

Divide both sides by (2/3)

x = -10 ÷ (2/3)

x = -10 × (3/2)

x = -15

To check

(2/3)x = -10

If x = -15

(2/3) × (-15) = -10 (Correct!)

Hope this Helps!!!

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