This is my last question I need to do what’s the answer

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

Can someone me do math because i am having a breakdown rn because i don’t get it

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?