The question is followed by two statements, I and II. Answer the question using the following instructions:

Mark option (1) if the question can be answered by using the statement I alone but not by using the statement II alone.
Mark option (2) if the question can be answered by using the statement II alone but not by using the statement I alone.
Mark option (3) if the question can be answered by using either of the statements alone.
Mark option (4) if the question can be answered by using both the statements together but not by either of the statements alone.
Mark option (5) if the question cannot be answered on the basis of the two statements.

Every student of a class either belongs to group A or group B or both. Group A has all students who scored more than 80% marks in the first unit test. Group B has students scoring less than 90% marks in the first unit test. 20% of group A are boys while 35% of group B are girls. 30 girls scored more than 80% but less than 90%. If the class has 130 students, how many boys belong to group A and group B as well?
Group A has 50 students.
Group B has 100 students.