Answer : The peter can buy 2 watches.
Step-by-step explanation :
Peter has total money = $100
Original price of a watch = $60
Discount % = 25 %
First we have to determine the price of a watch after discount.
Price of a watch = 
Price of a watch after discount = Original price - Price of a watch at the time of discount
Price of a watch after discount =$60 - $15
Price of a watch after discount = $45
Now we have to determine the price of 2 watches.
Price of 2 watches = 2 × $45
Price of 2 watches = $90
From this we conclude that, peter can buy 2 watches because he has $100 money that is more than the price of 2 watches.
Thus, the peter can buy 2 watches.