Presume 7x Cat C, 6x Cat B, 6x Cat A. 
Cat c = £23, Cat B = £25, Cat C = £28 
Total Match Day price = £479. 
Season Ticket is £415 this time I think.... 
Minus from the 479 the discounts available from the card - make this 3 lots of 5 stickers savings you sixty quid = saving of £4!! 
But the above is based on presumptions, I have no idea how many of each Catergory games there is, nor does it include the £1 booking fee for over the phone for each ticket, each game, nor does it include all but guaranteed away tickets, nor the discount on club merchandise.  
 You mean 15 X £5 = £75 
4 X £28 = £102 
Total £177 
Season ticket £400 ish ?? 
This is Williams/Rovers problem next season. One of their own making.