Use the simple interest formula to find the unknown quantity.

I = prt

I = $9

p = $450

r = 4%

t =

First, converting R percent to r a decimal

r = R/100 = 4%/100 = 0.04 per year,

then, solving our equation

t = 9 / (450 * 0.04) = 0.5

t = 0.5 years

The time required to

accumulate simple interest of $ 9.00

from a principal of $ 450.00

at an interest rate of 4% per year

is 0.5 years (about 0 years 6 months).