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QuestionIn 5 years, Gloria's bank account earned $2,400 interest at 5%. How much had she deposited in the account?

Sagot :

EXPLANATION

Given that Gloria's Bank Account earned $2,400 in 5 years, we can assevere the following relationship for Simple Interest:

[tex]Amount=P\cdot(1+r\cdot t)[/tex]

Where P=Principal r=rate=0.05 t=time=5 years

As the Amount is the sum of the Earns plus the Principal, we can replace the terms as follows:

[tex]\text{Earn}+\text{P}=\text{P}\cdot(1+r\cdot t)[/tex]

Subtracting P to both sides:

[tex]\text{Earn}=P\cdot(1+r\cdot t)-P[/tex]

Taking P as a common factor:

[tex]\text{Earn}=P\cdot(1+rt-1)[/tex]

Dividing both sides by rt:

[tex]\frac{Earn}{rt}=P[/tex]

Switching sides:

[tex]P=\frac{Earn}{rt}[/tex]

Replacing terms:

[tex]P=\frac{2,400}{0.05\cdot5}[/tex]

Simplifying:

[tex]P=\frac{2,400}{0.05\cdot5}=9,600[/tex]

In conclusion, the amount deposited was $9,600