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 and 50 paise per 20 square metres?​

Answer 1

area of four wall box = 2(l+b )×h

area of four wall box = 2(60+40)×30 = 6000 cm²

°•° 6000 cm convert into metre

6000 cm ÷ 100= 60 m

cost of painting 1 square metre = 50 paise

cost of painting 60 metre square = 60 ×50 paise = 3000 paise

Answer 2

Answer:

Step-by-step explanation:

Formula is 2h (l+b)+lb

Atq the answer we get is 3000cm2

Cost per 20 m is 50 Paise

3000/20×50 Paise

=7500 Paise and in rupee divide by 100

Rupees 75