He buys a plain croissant for $3.50 and an almond croissant for $5.50 for a total of $3.50 + $5.50 = $<<3.5+5.5=9.00>>9.00 on pastries per weekend
In one year, which is 52 weeks, he spends 52*$9 = $<<52*9=468.00>>468.00 on pastries
#### 468