If an Investor Invested $1,000 in 30-Day Commercial Paper on January

If an investor invested $1,000 in 30-day commercial paper on January 1,1927 and rolled over the proceeds into commercial paper every 30 days until December 31,1978,the investor would have earned approximately ___________ at the end of 1978.

A) $3,600
B) $67,500
C) $3,640,000
D) $5,360,000,000
E) none of these