60% of 50 =
                   ( 30 )

80% of 90 =
                   (       )

10% of 50 =
                   (       )

90% of 90 =
                   (       )

40% of 30 =
                   (       )

10% of 10 =
                   (       )

70% of 50 =
                   (       )

10% of 20 =
                   (       )

20% of 40 =
                   (       )

          +[         ]

4% of 70 =
                   ( 2.8 )

40% of 4 =
                   (       )

80% of 3 =
                   (       )

90% of 6 =
                   (       )

2% of 40 =
                   (       )

4% of 60 =
                   (       )

10% of 7 =
                   (       )

60% of 8 =
                   (       )

3% of 10 =
                   (       )

          +[         ]

5% of 40 =
                   ( 2 )

20% of 3 =
                   (       )

8% of 70 =
                   (       )

40% of 5 =
                   (       )

20% of 9 =
                   (       )

8% of 50 =
                   (       )

6% of 30 =
                   (       )

4% of 10 =
                   (       )

60% of 5 =
                   (       )

          +[         ]

       ++[[            ]]