Question

Which of the following is a better buy ?
(i) A dozen eggs for 21 or 8 eggs for 12 ?

Answer 1

Dozen eggs for $21$

Cost of $12$ eggs is $21$

Cost of $1$ egg is $\frac{21}{12}=\frac{7}{4}=1.75$

$8$ eggs for $12$

Cost of $8$ eggs is $12$

Cost of $1$ egg is $\frac{12}{8}=\frac{3}{2}=1.5$

In the second case cost per egg is less so the second one is better buy