How ro solve the 4 question

How ro solve the 4 question • . q.op pu!å pt. •un SE saxoq 01 pouu"d , pug p!oqn. e 01 pau'0( L • 'tun10A JO tupg •tupot up s t

First- Find the total surface areas of one speaker. Then, multiply it by 2 (since there are 2 speakers.) After that, multiply this number by Rs. 75. That is the total cost required.
Hope this helps. :)

     1.5cm,2cm, 11cm
LSA=2[l+b]h
         =2[5+2]11
         =2 X 7 X 11
        =14X11
​        =154 cm²
TSA=2[lb+bh+hl]
         =2[5X2 +2X11 +11X5]
          =2[10+22+55]
          =2X87
         =174cm^​2
volume=lbh
            =5X2X11
            =10X11
           =110cm^{​3 
similarly, you solve other question.}