Final answer:
The length of lace required is 4.71 meters, and the cost would be 70.65rs.
Step-by-step explanation:
To find the length of lace required to put at the edge of a circular table cover, we need to find the circumference of the table. The formula for the circumference of a circle is C = πd, where C is the circumference and d is the diameter.
Given the diameter of the table cover is 1.5 meters, we can find the circumference by multiplying the diameter by π (approximately 3.14).
C = 3.14 × 1.5 = 4.71 meters
Therefore, the length of lace required is 4.71 meters. If one meter of lace costs 15rs, the total cost would be 4.71 × 15 = 70.65rs.