Someone please help. 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?

Question

anonymous · Answer

ok so if P is principal

for one period she gets P*3.9% simple interest.

anonymous · Answer

formula is I = P r t, where r=% in decimal
t=periods(years)
P=Principal

anonymous · Answer

"Her initial deposit on the account was $630"
P = $630

otonogold · Answer

A = \frac{P 	imes r 	imes t}{100}

A = 1047.69
P = 630

r = 3.9

Put these values and solve for t...

otonogold · Answer

Soon as you set up your problem 
Multiply by 100 both sides

otonogold · Answer

104769=2457x
42 <-

anonymous · Answer

formula is A= P r t; not I above.