40% of 90 =
                   ( 36 )

20% of 40 =
                   (       )

30% of 80 =
                   (       )

70% of 40 =
                   (       )

30% of 60 =
                   (       )

30% of 50 =
                   (       )

40% of 90 =
                   (       )

80% of 60 =
                   (       )

40% of 80 =
                   (       )

          +[         ]

2% of 30 =
                   ( 0.6 )

7% of 70 =
                   (       )

50% of 7 =
                   (       )

20% of 1 =
                   (       )

5% of 70 =
                   (       )

2% of 10 =
                   (       )

80% of 1 =
                   (       )

4% of 30 =
                   (       )

10% of 5 =
                   (       )

          +[         ]

30% of 8 =
                   ( 2.4 )

5% of 70 =
                   (       )

10% of 2 =
                   (       )

70% of 8 =
                   (       )

4% of 40 =
                   (       )

1% of 90 =
                   (       )

8% of 60 =
                   (       )

60% of 4 =
                   (       )

80% of 9 =
                   (       )

          +[         ]

       ++[[            ]]