Total S.A of bigger box =2(lb+bh+lh)=2(25×20+25×5+20×5) cm2=2(500+125+100)=1450 cm2⇒For overlapping extra area required =100450×5​=72.5 cm2∴ Total S.A (including overlaps)=1450+72.5=1522.5 cm2Area of cardboard sheet for 250 such boxes=(1522.5×250) cm2Total S.A of smaller box =2(15×12+15×5+12×5)cm2=630 cm2For overlapping area required =100630×5​=31.5 cm2Total S.A (including overlaps)=630+31.5=661.5 cm2Area of cardboard sheet required for 250 such boxes=250×661.5cm2=165375 cm2Total cardboard sheet required =380625+165375=54000 cm2⇒Cost of 1000 cm2 cardboard sheet = Rs.4⇒Cost of 546000 cm2 cardboard sheet = Rs.1000546000×4​= Rs. 2184