consider the following information on put and call option for citigroup

strike price : 32.5 put price : 2.85 call price 1.65

1) calculate the net value of a protective put position at a stock price at expiration of 20 ?

we solved this question with the professor, the answer was as following:

value of protective put= ( (32.5-20) -2.85 ) + 20

thus the value of protective put = 29.65

my doubt is, why do we add 20 ?

this was our Doctor answer, but from what i know, protective put option strategy is : investor having long position in stock and long position in Put option.

thus, i think the value of protective put strategy should be: (profit on put ) =(32.5-20) -2.85 )

plus the profit on long position on stock ( we need the initial price of the stock to get that, and it is not given in the problem) so my doubt is, why did he solved the question this way ? why did he add the stock price at matuirty 20 to the profit on put position) ?