50% of 90 =
                   ( 45 )

30% of 50 =
                   (       )

50% of 80 =
                   (       )

40% of 50 =
                   (       )

90% of 70 =
                   (       )

50% of 60 =
                   (       )

10% of 90 =
                   (       )

10% of 60 =
                   (       )

10% of 80 =
                   (       )

          +[         ]

80% of 3 =
                   ( 2.4 )

40% of 8 =
                   (       )

7% of 70 =
                   (       )

4% of 10 =
                   (       )

2% of 80 =
                   (       )

4% of 20 =
                   (       )

9% of 20 =
                   (       )

10% of 4 =
                   (       )

70% of 6 =
                   (       )

          +[         ]

9% of 90 =
                   ( 8.1 )

60% of 8 =
                   (       )

3% of 30 =
                   (       )

80% of 9 =
                   (       )

1% of 40 =
                   (       )

80% of 1 =
                   (       )

50% of 7 =
                   (       )

80% of 5 =
                   (       )

5% of 10 =
                   (       )

          +[         ]

       ++[[            ]]