Mr.Moore will read 67 pages on Sunday. The pattern will continue each day by 12. So on Friday he will have 53 pages read. On Saturday he will have 60 Pages read. And on Sunday he will have 67 pages read. :)
To find the percentage out of a fraction you would divide 4÷5 to get 0.8, the decimal answer, then to turn that to a percent you would move the point two places to the right to get 80%.