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marin [14]
4 years ago
7

After 4 years aspen earned $510 in simple interest from a cd into which she initially deposited $3000. What was the annual inter

est rate if the CD
a) 13%
b) 11.75%
c) 4.25%
d) 8.5%
Mathematics
2 answers:
Alexeev081 [22]4 years ago
6 0
I = PRT...and since we are looking for r.....I / PT = R

I / PT = R
I = 510
P = 3000
T = 4

510 / (3000 * 4) =
510 / 12,000 =
0.0425 .....multiply by 100 to get the percent
4.25% <==
tiny-mole [99]4 years ago
4 0

Answer:

Annual interest rate is

c) 4.25%

Step-by-step explanation:

let amount deposited=P=$3000

time period=T=4 years

annual interest rate=R

Simple interest=I=$510

by the formula bof simple interest

  I=\dfrac{P\times R\times T}{100}\\ \\510=\dfrac{3000\times R\times 4}{100}\\\\R=4.25\%

hence, annual interest rate is 4.25%

hence option c) is correct

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