He spends $10/snake * 4 snakes = $<<10*4=40>>40 to feed his snakes every month
He spends $5/iguana * 2 iguanas = $<<5*2=10>>10 to feed his iguanas every month
He spends $15/gecko * 3 geckos = $<<15*3=45>>45 to feed his geckos every month
So overall he spends $40 + $10 + $45 = $<<40+10+45=95>>95 to feed all his pets every month
Therefore every year pet food costs him $95/month * 12 months = $<<95*12=1140>>1140
#### 1140