Quote: If I put $150 in an account that earns 7%, how much will there be in the account at the end of 30 years?
You need to specify that the interest is compounded annually (as opposed to quarterly or monthly) but assuming that we have
FV = future value
PV = present value
r = rate
t = time in years
FV = PV(1+rate)
t and in this case we have
FV = $150(1+0.07)
30 = $1141.84
+6251 
