Overtime is usually time and a half which means you get paid however much you get an hour plus half so if you make $8 an hour, during overtime you make $12 an hour. That being said if someone works 9-5, 5 days a week; that’s 40 hours a week. So two weeks would be 80 hours. $12 x 80 = $960 but you’re not giving me much context so I’m not sure if this is what you needed
The formula for finding the circumference is pi times the diameter so If your giving it in terms of pi then you're just finding the diameter which is 15