Hi,

 3 chairs and 1 table cost rs.900 and 5 chairs and 3 table cost rs.2100

Let x and y represent the cost of a chair and a table respectively

  3x +  y = 900

  5x + 3y = 2100   |Multiplying the 1st Eq by 3 and subtracting from 2nd EQ

      -4x = -600

         x = 150, chair cost.  Table Cost is  rs. 450

and...cost of 4 chairs and 1 table is?

  = rs. 1050 

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