please check if my answer is correct or not

A stock currently sells for $80 and will pay $5-dividend in year 1 and year 2. 3-year European put option on this stock has the strike price of $80. The put price is $4. The risk-free rate is 2% per annum. Is there an arbitrage? If so, find the arbitrage strategy and its cash flows.

Lower bound

=max(K*e^-rT-(S0-D),0)

= 5.046103249

Upper bound

= 75.34116269

Since the put price is below the lower bound, arbitrage opportunity exists.

Arbitrage strategy:

	0	1	2	3
long put	-4	0	0	MAX(80-ST,0)
buy stock	-70.2951	4.900993367	4.803947	ST
sell bond that pays K at T	75.34116	0	0	-80
net	1.046103	4.900993367	4.803947	max(80,ST)