If the first number is 20% less than the third number and the ratio of the second to the third number is 7 ∶ 10, then the average of the first and the third number is how much per cent more than the second number?
1
26\(4 \over 7\)
2
28\(2 \over 7\)
3
28\(4 \over 7\)
4
24\(2 \over 7\)