Summer Inc. wants to upgrade their computer system. They estimate the following CFs over the next $4$ years:

Year $1$: $$1,000$; Year $2$: $$1,800$; Year $3$: $$2,400$; Year $4$: $$3,000.$

If they want $7\%$ return on their investment, how much should they pay for the upgrade now?

$$8,854$

$$7,211$

$$6,755$

$$5,762$