in short, 25% is just 1/4 of anything, we know she's sold 25% which is $600, so her daily goal must be 1/4 + 1/4 + 1/4 + 1/4, or namely 600 + 600 + 600 + 600 = 2400.
The cross section is a trapezoid.
Surface area of cone = πr(r+√(h2+r2))
where r is the radius of the circular base
h is the height of coneOr
Surface area of cone =πr(r+L)
where L is the slant height of the cone
