Q1. The answer is 3.99 for 32
Express both prices as prices for 1 oz, so they can be compared.
$2.99 for 22oz. x for 1oz.
$2.99 : 22oz = x : 1oz
x = $2.99 * 1oz : 22oz
x = $0.14
$3.99 for 32oz. x for 1oz.
$3.99 : 32oz = x : 1oz
x = $3.99 * 1oz : 32oz
x = $0.12
So, 3.99 for 32 is the better deal.
Q2. The answer is 1.59 for 16.
Express both prices as prices for 1 oz, so they can be compared.
$1.09 for 8oz. x for 1oz.
$1.09 : 8oz = x : 1oz
x = $1.09 * 1oz : 8oz
x = $0.14
$1.59 for 16oz. x for 1oz.
$1.59 : 16oz = x : 1oz
x = $1.59 * 1oz : 16oz
x = $0.10
So, 1.59 for 16 is the better deal.
Q2. The answer is $0.56 for 8 oz.
Express both prices as prices for 1 oz, so they can be compared.
$0.56 for 8oz. x for 1oz.
$0.56 : 8oz = x : 1oz
x = $0.56 * 1oz : 8oz
x = $0.07
$1.99 for 25oz. x for 1oz.
$1.99 : 25oz = x : 1oz
x = $1.99 * 1oz : 25oz
x = $0.08
So, $0.56 for 8 oz is the better deal.