Question 395612
The equation for finding simple interest is I=PRT, where I represents interest, P represents principle, R represents rate, and T represents time. 
If we substitute all the variables given, then the equation looks like:
I=PRT
{{{360=1800*.1*t}}}
Now, we have one equation with one variable, which means that we can solve it.
{{{360=1800*.1*t}}}
{{{360=180t}}}
{{{2=t}}}
So, the time factor is two.