Pls help thx

Rita wants to buy sweater that was originally priced at $25 today the sweater is on sale for 40% off the original price what is the sale price of the sweater. rita has a coupon for an addition 10% off the sale price. how much will rita pay for the sweater before taxes

Can someone me out here and the tell me the greatest common factor

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°