It would have been a lot quicker to use your calculator. And you could be more assured of the accuracy of your result. I can tell you that the answer is 96.25 but how do you know I did not make a mistake? Or that I am not messing about?
770
20.2632
48.125
0.0065
5.613
7
760 and 770
385
10 / 770 = 0.01299
The radius is half the diameter. Therefore, 770 divided by 2 equals 385mm
20% off of 770 = 616= 20% discount applied to 770= 770 - (20% * 770)= 770 - (0.20 * 770)= 770 - 154= 616
2.5% of 770 is 19.25. 2.5% of 770 = 2.5% * 770 = 2.5%/100% * 770 = 0.025 * 770 = 19.25