Starting today, Stephen i 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 earn a monthly rate of $1\%,$ how much will stephen have in his retirement account $40$ years from now? a$)3,564,726$ b$)1,779,023$ c$)1,414,929$ d$)2,546,980$