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We know how much 16 keychains is, now we need to find how much one is.

19.68 / 16 = $1.23

$1.23 is the price of one keychain, now you can multiply that by 25 to see how much 25 keychains cost.
To get the cost for 1 key chain, divide $19.68 by 16.
$19.68 / 16 = $1.23

Multiply by 25 to see how much 25 key chains would cost.
25 * $1.23 = $30.75

25 key chains would cost $30.75