88
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90
You add up the numbers, then divide by how many numbers you added. Here there are 4 numbers to add up: 81+83+87+85. Use a calculator or do longhand. Then divide the sum by 4 to get the average.
87% 100 of 87
0.87
87/100 is equal to 0.87 . As a fraction, 87/100 can't be any further reduced (simplified).