In which of these cases is eacha washing machine is filling up with water at a constant rate. the rate is 34 of a gallon in 15 of a minute. don calculated the unit rate to be 320 of a gallon per minute. what did he do wrong stamp worth the most? OPTION 1: 1. 7 of the same stamp worth a total of $3.15 OPTION 2: 2. 8 of the same stamp worth a total of $3.20 OPTION 3: 3. 10 of the same stamp worth a total of $4.10 OPTION 4: 4. 16 of the same stamp worth a total of $4.80