Calculate:

$($a$)$ N$.$P$.$ ratio and

$($b$)$ Administration expenses ratio, sales Rs$.10,000$

$\backslash$table$[[.,\backslash$table$[[P$ and L$],[$Rs$.]],\frac{A}{c},$Rs$.],[$To Admn. expenses,$1,600,$By Gross profit,$2,500],[$To Selling expenses,$300,,],[$To Finance expenses,$100,,],[$To Net profit,$500,,],[2,500,,2,500],[2,\frac{MB}{MB},$