Principal = $2,400
Rate = 4%
Time = 30 months

$240

Step-by-step explanation:

I = prt

I = (2,400) (0.04) (2.5)  

note: I changed 4% to a decimal and 30 months to 2.5 years

I = 96 (2.5)

I = 240   <-- The interest

The simple interest accumulated on a principal of $ 2,400.00  at a rate of 4% per year for 2.5 years (30 months) is $240.00.

* Last time I did interest was in 6th grade and I don't remember much. So I am very sorry if my answer is wrong *