Downward Sloping Yield Curve

Maturity	Coupon	Price	Yield-to-Maturity	Spot Rate
0.5	0	-	3.90	3.90
1.0	0	-	3.50	3.50
1.5	3.30	100	3.30	?
2.0	3.00	100	3.00	?
2.5	2.80	100	2.80	?

Compute the Spot Rates for the last 3 Rows given the information.

Please show all work as I am unsure how to do this myself.

Thank you.