Multiply $530.40 by 3/4. You get the equation

If you simplify this, you get the solution of $397.80
$397.80
For the lateral area, don't include the base area. For the surface area, you should include it.
If I’m correct this is supposed to be a decimal ( here we use the dot not the comma ) but if so then 32.52 a good way to remember is 5 or more let it sore (meaning round up) four or less let it rest (meaning it stays the same)
6 3/4=6*4+3/4=24+3/4=27/4
z/12=27/4
4z=27*12
4z=324
z=81