Find the Final Amount (Rounded to the Nearest Dollar) in This

Multiple Choice

Find the final amount (rounded to the nearest dollar) in this retirement account, in which the rate of return on the account and the regular contribution change over time.
- $\$ 700$ per month invested at $6 \%$ , compounded monthly, for 25 years; then $\$ 3000$ per month invested at $7 \%$ , compounded monthly, for 25 years.

A) About $\$ 6,523,436$
B) About $\$ 5,325,581$
C) About $\$ 2,915,311$
D) About $\$ 5,207,591$