Question

Find the cost of painting the all around outer surface of a box with lid 60 cm long, 40 cm wide and 30 cm high at 50 p per 20 cm2.

Answer 1

Answer:

270 rupees

Step-by-step explanation:

first we have to find the t.s.a of the box

then we have divide the t.s.a with 20

finally we have to multiply 50/100 with the above solution

since the box is in the form of cuboid  

t.s.a of the box = 2 { lb + bh + hl }

                         = 2 { (60 *40 ) + (40 *30) +(30*60 )}

                         = 2 {2400 +1200 + 1800}

                         =2*5400

                          = 10800 cm sq

=10800/20 =540 cm. sq

since 50p = 0.5 rupees

therefore cost of painting  = 540*0.5 =270