90% of 20 =
                   ( 18 )

70% of 60 =
                   (       )

80% of 10 =
                   (       )

30% of 60 =
                   (       )

80% of 90 =
                   (       )

80% of 80 =
                   (       )

90% of 30 =
                   (       )

40% of 80 =
                   (       )

90% of 10 =
                   (       )

          +[         ]

70% of 4 =
                   ( 2.8 )

3% of 10 =
                   (       )

10% of 9 =
                   (       )

7% of 20 =
                   (       )

1% of 10 =
                   (       )

8% of 30 =
                   (       )

40% of 4 =
                   (       )

90% of 5 =
                   (       )

60% of 7 =
                   (       )

          +[         ]

80% of 2 =
                   ( 1.6 )

1% of 90 =
                   (       )

6% of 40 =
                   (       )

30% of 2 =
                   (       )

9% of 50 =
                   (       )

70% of 2 =
                   (       )

4% of 90 =
                   (       )

20% of 7 =
                   (       )

40% of 2 =
                   (       )

          +[         ]

       ++[[            ]]