Please answer as quickly as possible and correctly and I will give a thumbs up all steps do NOT have to be shown as long as the final answer is correct, thank you.

Based on the following cash flows with different rates as shown in the CFD, find the Net Sum as of period 5 , i.e., F5= ? t=0,$2,000t=1,$2,000t=2,$1,600t=3,$2,000t=6,$1,600t=8,$3,500 $6,665. $5,782. $7,919. $7,190. $7,779