The ratio is 21.1 now give me my 33 dolar
Answer:
11 years 7 months 7 days(if 31 days a months) and change 7 days to 9 days if assuming 30 days a moths
If it's a regular octahedron, then you can calculate it using the formula

where

is the length of the edge.
If it's not regular, you have to calculate the area of each side individually.
The answer is :
the amount of the bill before the tip = 14.58 *100 /15 = 97.20 $