Question

Salina currently has an account balance of $1,047.69. Her initial deposit on the account was $630 and it earned 3.9% simple interest. How long has Salina held the account?

Answer 1

her current balance is $1,047.69
her initial deposit was $630

the difference is 1047.69 - 630 = 417.69

she earns 3.9% simple interest rate, which the earned interest is 417.69
so 3.9% for this many years has earned $417.69
\(\bf interest = principal(\textit{deposit})\times rate(\textit{in decimal})\times time(\textit{years})\\ \quad \\
i = prt\implies \cfrac{i}{pr}=t\\ \quad \\
3.9\%\textit{ in decimals is }0.039\\ \quad \\
\cfrac{i}{pr}=t\implies \cfrac{417.69}{630\times 0.039}=t\)

Answer 2

0.025857

Answer 3

hmmm ? 0.025857?

Answer 4

recheck... again.... seems your PEMDAS may be a bit off

Answer 5

17

Answer 6

:)

Answer 7

17years

Answer 8

thanks

Answer 9

yw