Ashirt originally cost $36.24, but it is on sale for $30.80. what is the percentage decrease of the price of the shirt? if necessary, round to the nearest percent.
85%
18%
12%
15%
the last few question i had no one has like why?

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.