A mirror of length 20 cm and width 15 cm is to be framed with a 2 cm wide frame. Find the area of the frame required. Also, find the cost of framing at the rate of Rs 15 per cm².

Dear Student,

Please find below the solution to the asked query:

We form our diagram from given information , As :

Here dimension of mirror : Length = 20 cm and breadth = 15 cm

And

Dimension of mirror with frame : Length = ( 2 + 20 + 2 = 24 ) cm and breadth = ( 2 + 15 + 2 = 19 ) cm

We know area of rectangle  = Length $\times$ Breadth 

So,

Area of mirror = 20 $\times$ 15 =  300 cm²

And

Area of mirror with frame = 24 $\times$ 19 = 456 cm² , So

Area of frame  =  456 - 300 =  156  cm²                                                   ( Ans )

And given : Framing at the rate of Rs 15 per cm². So

Cost of framing =  156 $\times$ 15 = Rs. 2340                                                    ( Ans )


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