a) What do you have to save each year to have $1,000,000 in 40 years if you earn a 7% return?

b) What do you have to save each year to have $1,000,000 in 30 years if you earn a 7% return?

c) What do you have to save each year to have $1,000,000 in 20 years if you earn a 7% return?