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Petra deposited $278.16 in a savings account that earns 2.1% simple interest. What is Petra’s account balance after nine years?

User L Martin
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2 Answers

3 votes

Answer:

the answer is c.330..

Explanation:

got it right

User Russ Petersen
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7.8k points
2 votes
The answer is $330.73.

Step 1. Calculate simple interest: I = ?
Step 2. To get account balance add simple interest to the principal amount:
I + P = ?

Step 1. Calculate simple interest.
I = P * r * t
P - principal
r - rate
t - time period

We have:
P = $278.16
r = 2.1% = 2.1/100 = 0.021
t = 9

I =
278.16 * 0.021 * 9 = 52.57

Step 2. To get account balance add simple interest to the principal amount:
I + P = ?
52.57 + 278.16 = 330.73
User YotamN
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8.4k points