The rules:
First, I want to let you know (x) is multiplication. But, dot (.) is sum

10.20.30x10/ --> the result is 30
235.458.101x25.20/ --> the result is 135
1120.1135x10/ --> the result is 20

So, numbers before (x) is counted by the sum of dot (.)+1 -->(first result)
Number/s after (x) is counted by the sum of numbers between (x) and slash (/) -->(second result)
The final result is multiplication of first and second result

There are 3 ways for possible numbers before (x)
2 numbers/+dot(.), ex: 01 or 45 etc
3 numbers/+dot(.), ex: 245 or 939 etc
4 numbers/+dot(.), ex: 1174 or 8364 etc

Possible sum after (x)
For 2 numbers before (x) --> 1 sum
For 3 numbers before (x) --> 1 or 2 sum
For 4 numbers before (x) --> 1 or 2 or 3 sum

S01=20?49.41.80.70.30.13.85.49.99.11.74.58.94.32.68.1149.149.49.94.85.41.30.49x20

S02=20?57.75.73.37.43.34.57.75.85.45.74.73.32.68.45.3385.385.85.58.1283.283.83.38.33.38.83.35.53.85.58.61.16.25.57.561.061.61.25x5

S03=20?61.16.10.01.06.60.56.65.15.51.61.25.97.55.54.45.53.35.50.05.70.07.73.37.74.47.75.57.00.03.30.04.40.05.50.16.52.88.24.15.74.02.16.52.55.93.51.39.20.89.55.72.70.07.57.61.16.52.88.172.170.061.561.6874.874.74.47.055.50.61.89x10