Length = 30cm
Breadth = 20cm.
To frame she need to find the perimeter.
Thus, Perimeter = L x B
= 30 x 20 = 600cm
Cost of 1 cm of lace= Rs. 10
Cost of 600 cm of lace= 10 x 600
=6,000
Thus, Sima needs 600cm of lace and she has to
spend Rs. 6,000 to buy the lace.