Question

how to solve the question no.2​

Answer 1

Answer:

for the plaster on inner curved surface of well

we have to calculate the inner curved surface area of well = 2*π*r*h --------------- eq1

where r is the radius of well

h is the depth of the well

So the inner curved surface area of the well= 2*π*1*20

=> =2*3.14*1*20

=> =125.6 m square

cost of plaster on inner curved surface is 50 rupees per meter square

so the total cost of plaster on inner curved surface of the well= 50* area of inner curved surface

=> cost = 50 * 125.6=6280 rupees

the total cost of plaster on inner curved surface of the well=6280 rupees