Can anyone pls help im struggling with this

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?