Answer
$0.05
Explanation:
Given that cost of 42 Oreos cookies costs $2.10
42 oreo cookies = $2.10
To get the cost per cookie,
1 cookie = x
Divide both expressions
42/1 = 2.10/x
Cross multiply
42 * x = 1 * 2.10
42x = 2.10
Divide both sides by 42;
42x/42 = 2.10/42
x = 2.10/42
x = 0.05
Hence the cost per cookie is $0.05