6.4 Starting today, Stephen is going to contribute $200 on the first of each month to his retirement account. His employer will contribute an additional 50% of the amount Stephen contributes. If both Stephen and his employer continue to do this and he can eam a monthly rate of 0.75%, how much will Stephen have in his retirement account 40 years from now? A. $936,264 B. $943,286 C. $1,404,396 D. $1,414,929 E. $1.672,413