A song has 12 beats every 5 seconds. How many beats are there in 30 seconds?

12/5 = 2.4 beats per second
2.4 * 30 = 72 beats

The answer is c because you turn 17.5% into a decimal which gives you .175 then you times that by $361.35 which gives you 63.23625 but then you round that which gives you 63.24. then you at 63.24 pulse 361.35 and you round it which gives you $425