Raju earns Rs 16,000 per month. He spends $\large\frac{1}{4}$ of his income on food; $\large\frac{3}{10}$ of the remainder on house rent and $\large\frac{5}{21}$ of the remainder on education of children . How much money is still left with him ?

Question

$\begin{array}{1 1} 6400 \\ 3000 \\ 7000 \\ 2000 \end{array}$