Answer :
Since [tex] \frac{5000}{2000} = \frac{5}{2} [/tex], multiplying 12 by [tex] \frac{5}{2} [/tex] should give you your answer.
[tex]12* \frac{5}{2} = 30[/tex]
[tex]12* \frac{5}{2} = 30[/tex]