Question

a mirror of length 20 cm and width 15cm is to be framed with a 2 cm wide frame required. also find the cost of framing at the rate of Rs.15 per cm square

Answer 1

The frame will have a width of 15 cm plus 2 cm on each side = 15 + 2 + 2 = 19 cm. The length will be 20 cm plus 2 cm on each side for a total length of 20 + 2 + 2 = 24 cm. 
The perimeter will be 2 (l + w)
= 2 x (19 + 24)
= 2 x 43
= 86 cm 

Answer 2

Answer: Cost of framing is Rs. 6840.

Step-by-step explanation:

Since we have given that

Length of mirror frame would be

20+2+2=24 cm

Width of mirror frame would be

15+2+2=19

Area of frame would be

length × breadth

24 × 19

= 456 cm^2

Cost per sq. Cm = Rs. 15

Total cost would be

456×15 = Rs. 6840

Hence, cost of framing is Rs. 6840.