In order to find the answer, first you have to consider that 1 pound is equal to 16 ounces and with that information, you can use a rule of three to find the pounds that 24 ounces represent:
1 pound → 16 ounces
x ← 24 ounces
=(24*1)/16=1.5
Now that you know, that 24 ounces are equal to 1.5 pounds you can multiply the price per pound for the number of pounds to find the amount that you need to pay:
6.4*1.5=9.6
According to this, the answer is that you have to pay 9.6.
