Q.21. Mr. Mehra wants to decorate his his room with wallpaper which costs Rs. 125 per $m^{2}$ . If the dimensions of Mr. Mehra's room are $15 m \times 12 m \times 4 m$ . Find the cost of decorating the 4 walls.

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Solution

Dear Student,

$A r e a o f 4 w a l l s o f r o o m = 2 \times h (l + b) G i v e n t h a t d i m e n s i o n s o f 15 \times 12 \times 4 h e r e l = 15, b = 12 a n d h = 4 A r e a o f 4 w a l l s = 2 \times 4 \times (15 + 12) = 8 \times 27 = 216 m^{2} C o s t o f d e c o r a t i n g 1 m^{2} = 125 \cos t o f d e c o r a t i n g 216 m^{2} = 125 \times 216 = 27000 H e n c e t o t a l \cos t i s 27000 R u p e e s$

Regards,

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Q.21. Mr. Mehra wants to decorate his his room with wallpaper which costs Rs. 125 per m2. If the dimensions of Mr. Mehra's room are 15 m×12 m×4 m. Find the cost of decorating the 4 walls.

Dear Student, Area of 4 walls of room=2×hl+bGiven that dimensions of 15×12×4here l=15,b=12 and h=4Area of 4 walls=2×4×15+12=8×27=216 m2Cost of decorating 1m2=125cost of decorating 216 m2=125×216=27000Hence total cost is 27000 Rupees Regards,

Q.21. Mr. Mehra wants to decorate his his room with wallpaper which costs Rs. 125 per $m^{2}$ . If the dimensions of Mr. Mehra's room are $15 m \times 12 m \times 4 m$ . Find the cost of decorating the 4 walls.