Let's think step-by-step. We can use the formula: percentage = (part/whole) x 100. In this case, the part is 77 and the whole is 88. So, percentage = (77/88) x 100.
The answer is 87.5. To find the percentage, divide the part by the whole and multiply by 100. In this case, divide 77 by 88 and multiply by 100: 77/88 * 100 = 87.5.