The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the

Question

The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the 
United States then becomes 
P (in millions) = 250 times 2( y-1990)/66

What will the population of the United States be in 2025 if this 
growth rate continues?

Did I do this correct

P=250*2^(2025-1990)/66 
p=250*2^35/66 
p=250*2^.53 
p=250*1.444 
p=361 million

is this correct if not please explain what i did wrong

i don't think that it is (2^),isn't it suppose to be times by two? 
so,

P=250*(2*(2025-1990)/66) 
P=250*(2*(35/66)) 
P=250*1.06 
P=? 
and you have your final answer here! =)

carry, you are right.