The best way to find out the cost of three pounds is to first find the cost of 1 pound. In order to find one pound, you have to divide $10.43 by 7 in order to find out the cost of 1 pound. The cost of 1 pound is $1.49. In order to find the cost of three pounds, you have to multiply the cost of 1 pound by three. Therefore, the cost of 3 pounds is $4.47
Hope this helps :)
