Question 31437
You will need to apply the formula A = P(1+r)^t where A is accumulated money after t years at the rate of r% per year compounded

So, Accumulated Money = 250(1+.06)^40 .. gives you the answer

If interest rate is simple, the formula is A = P(1+rt).  In that case Accumulated money would have been 250(1+.06*40)