You are set to receive $$1,670$ annually $($at the end of each year$)$ forever with returns of $15\mathrm{.}10\%$ for the first $7$ years and $4\mathrm{.}80\%$ thereafter. What is the current value of this investment?

a$.$ $$19,927$

b$.$

$$14,963$

c$.$

$$34,792$

d$.$

$$11,060$

e$.$

$$13,000$