Which answer is 0.57 written as a %a 0.0057%b 0.57%c 57%d 570%i will give brainlist to whoever is correct

An internet company charges $8.95 per month for the first 3 months that it hosts your web site. then the company charges $11.95 per month for web hosting. how much money, in dollars, will the company charge for 8 months of web hosting?

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22

Can anyone with some algebra 1 homework? : )