Simply convert the dollar amount to what it would be without a decimal (I.E 1.00->100) then divide by the amount of ounces to get what each ounce costs.
100/16= 6.25
129/21= 6.14 (give or take)
149/32= 4.6.
Then you convert that value to cents and you find out the 32 oz is almost a cent and half cheaper per ounce.
