1) 189 rs.

2) 176

3) 58

4) 121/125

One pen costs rs. 15&(3/4)

1 doz. pen costs (15&(3/4)) x 12 eq. 

(63/4)x 12 eq. 63x3 eq. 189 rs.

2) (2/5)x(rs. 65) plus (5/7)x(rs. 210)

(2x13) rs. plus (5x30) rs.

26 plus 150 eq. 176

3) ((1/8)x960) - ((2/5)x155)

    120-62

   Eq.  58

4) (2&1/5)/(2&3/11)

   (11/5)/(25/11)

 (  11/5) x (11/25)

121/125