Question

Hey Guys☺☺....$Plz\: solve\: question\: 7\: of\: the\: attachment \:pic$....[50 points]. ....

Answer 1

Dimensions pf bigger box = 25cm x20cmx5cm

Tsa of bigger box = 2(lb+bh+hl)

=2(25x20+20x5+5x25)


=1450cm2

Dimension of smaller box =15cmx12cmx5cm

Tsa pf smaller box = 2(lb+bh+hl)

=2(15x12+12x5+5x15)

=630cm2


Tsa of 250 boxes of each type

=250(1450+630)


=250x2080

=520000cm2

Extra area required =5/100(1450+630)250

=26000cm2

Total cardboard required =520000+26000

=546000cm2

Total cost of cardboard sheet=546000x4/1000

=2184rs

Answer 2

HEY MATE!

Answer :

For bigger boxes : 

t = 25 cm, b = 20 cm, h = 5 cm 

Total surface area of 1 bigger box = 2(lb + bh + hl) 

= 2(25 × 20 + 20 × 5 + 5 × 25) cm2 

= 2 (500 + 100 + 125) cm2 = 1450 cm2 

Area of cardboard required for overlaps 

= 5% of 1450 cm2 = 1450x 5 /100 × cm2 = 72.5 cm2.

Total area of cardboard needed for 1 bigger box 

= (1450 + 72.5) cm2 = 1522.5 cm2 

Total area of cardboard needed for 250 bigger boxes = 1522.5 × 250 cm2 

= 380625 cm2. 

For smaller boxes : 

t = 15 cm, b = 12 cm, h = 5 cm 

Total surface area of 1 smaller box = 2 (lb + bh + hl) 

= 2(15 × 12 + 12 × 5 + 5 × 15) cm2 

= 2 (180 + 60 + 75) cm2 = 630 cm2 

Area of cardboard required for overlaps

= 5% of 630 cm2 = 630x 5 /100 × cm2 = 31.5 cm2 

Total area of cardboard needed for 1 smaller box = (630 + 31.5) cm2 

= 661.5 cm2 

Total area of cardboard needed for 250 smaller boxes 

= 661.5 × 250 cm2 = 165375 cm2 

Now, total area of cardboard needed for 500 boxes (250 bigger and 250 

smaller boxes) = (380625 + 165375) cm2 = 546000 cm2 

Cost of 1000 cm2 of cardboard = Rs 4 

∴ Cost of 546000 cm2 of cardboard = Rs 4/1000 × 546000 = Rs 2184 Ans