Acone - shaped building has a height of 6 meters and a base with a diameter of 10 meters. the building will be filled with road salt that costs $25 per cubic meter. how much will it cost to fill the building with road salt? use 3.14 for π round to the nearest hundredth me

The formula for the volume of a cone is
.. V = (1/3)*π*r^2*h
The radius (r) is half the diameter, so is 5 m. Fill in the numbers and do the arithmetic.
.. V = (1/3)*3.14*(5 m)^2*(6 m) = 157 m^3

The cost will be $25 for each of those cubic meters, so is
$25*157 = $3925.00.

Formula
V= (1/3) pi r^2 h
r = d/2 = 10/2 = 5
h = 6
pi = 3.14
V = (1/3) * 3.14 * 5^2 * 6
V = (1/3) * 471
V = 157 cubic meters.

1 cubic foot cost $25
157 cubic feet cost x Cross multiply.

x = 25 * 157
x = 3925 dollars.

The discount is 20%.

16  x  3 =   $48.00 regular price for 3 CDs

$48.00 - $38.40 =  $9.60

$48.00  x   20%

48  x  .20  =  9.6

Hope this helps. :)